{"title":"Milltek Audi S4 Performance Exhaust Systems","description":"\u003cp\u003eMilltek's Audi S4 range covers five generations: the B5 2.7T quattro (1997 to 2001), the B6 and B7 4.2 V8, the supercharged 3.0 V6 B8 and B8.5 (2009 to 2016) and the B9 3.0 Turbo V6 Saloon and Avant from 2016. There are cat-back systems for each, cat replacement pipes for the V8 and B9, sports cat and HJS ECE downpipes and Active Valve Control for the B9, and Active Sound Control for the B9 3.0 Bi-TDI. See the \u003ca href=\"\/collections\/audi-performance-exhaust-systems\"\u003eMilltek Audi range\u003c\/a\u003e for other models.\u003c\/p\u003e","products":[{"product_id":"milltek-cat-back-exhaust-audi-s4-2-7t-quattro-b5-97-01","title":"Milltek Cat Back Exhaust Audi S4 2.7T Quattro B5 97-01","description":"\u003ch2\u003eMilltek Cat-back Exhaust for Audi RS4 B5 V6 Bi-Turbo Avant (2000-2002) – Sharper Sound, Reduced Back Pressure\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's cat-back system for the Audi S4 2.7T quattro B5. It replaces everything from the factory catalytic converter rearward with wider-bore pipework, a re-profiled mid-pipe and silencers tuned specifically for this platform, cutting back pressure and sharpening the exhaust note. The factory catalytic converter stays in place, so the car's emissions hardware is left as standard. It's offered in non-resonated or resonated EC approved versions, so you can pick the setup that suits how the car's used.\u003c\/p\u003e\n\u003cp\u003eIt's aimed at owners who want a noticeably different sound and a genuine, if modest, flow improvement without touching anything upstream of the cat: a straightforward bolt-on that doesn't need a remap or any other supporting mods to enjoy.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Cat-back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Style:\u003c\/strong\u003e Pulse\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eReplaces the standard exhaust from the catalytic converter back, so the factory cat is retained\u003c\/li\u003e\n\u003cli\u003eEC approved versions available\u003c\/li\u003e\n\u003cli\u003eResonated (quieter) or non-resonated (louder) versions\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi RS4 B5 V6 Bi-Turbo Avant (2000-2002)\u003c\/li\u003e\n\u003cli\u003eAudi S4 2.7T quattro B5 (1997-2001)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e any model, engine or body style not listed above. Check your car before ordering.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eSome versions: Non-Resonated. For fitment to OEM Catalysts (RS4 B5 Style - Requires Rear Diffuser to be modified). Some versions: Resonated. For fitment to OEM Catalysts ECE Approved (RS4 B5 Style - Requires Rear Diffuser to be modified). We recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.\u003c\/p\u003e\n\u003ch3\u003eWhat's the difference between the resonated and non-resonated versions?\u003c\/h3\u003e\n\u003cp\u003eThe resonated version adds extra silencing for a quieter, more refined tone. The non-resonated version leaves it out, so it is louder and more aggressive.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 2.7T quattro B5?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 2.7T quattro B5 as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eSome versions are EC approved; check the EC Approved line in the specification for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eNo. It fits behind the factory catalytic converter, so no software changes are needed.\u003c\/p\u003e\n\u003ch3\u003eDoes it keep the factory catalytic converter?\u003c\/h3\u003e\n\u003cp\u003eYes. It fits behind the factory catalytic converter, which stays in place.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Non-Resonated","offer_id":56392723071361,"sku":"MIL-SSXAU008","price":1236.86,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved","offer_id":56392723104129,"sku":"MIL-SSXAU002","price":1272.93,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU002_2_82354a63-2b75-4cd3-9ff5-5c78e78f0065.jpg?v=1791891258"},{"product_id":"milltek-active-sound-control-audi-s4-3-0-bi-tdi-b9-saloon-avant-diesel-19","title":"Milltek Active Sound Control Audi S4 3.0 Bi-TDI B9 Saloon Avant Diesel 19+","description":"\u003ch2\u003eMilltek Active Sound Control for Audi A6 3.0 Bi-TDI C7 (2011-2018) – Adjustable Engine Sound\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's active sound control system for the Audi S4 3.0 Bi-TDI B9 Saloon\/Avant (Diesel). It works with the vehicle's existing valve or flap system, giving you control over the exhaust note from inside the car without any physical changes to the pipework itself, so you can move between a quiet cruising tone and a sharper, more aggressive sound whenever you like.\u003c\/p\u003e\n\u003cp\u003eIt suits owners whose car already has a factory valve system they'd like more control over, rather than those looking for a change in outright flow or volume.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Active Sound Control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValvesonic:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi A6 3.0 Bi-TDI C7 (2011-2018)\u003c\/li\u003e\n\u003cli\u003eAudi A7 C7 3.0 Bi-TDI (2011-2018)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Bi-TDI B9 Saloon\/Avant (Diesel) (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 Bi-TDI B9 Coupe (Diesel) (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S6 3.0 TDI C8 Saloon\/Avant (Diesel) (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S7 Sportback 3.0 TDI C8 (Diesel) (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi SQ5 3.0 V6 Bi-TDI (Diesel) (2014-2016)\u003c\/li\u003e\n\u003cli\u003eAudi SQ7 4.0 V8 TDI (2016-2020)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e any model, engine or body style not listed above. Check your car before ordering.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. This involves connecting to the car's wiring and exhaust valves, so we recommend fitting by a specialist familiar with the car's electrics.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi A7 C7 3.0 Bi-TDI?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi A7 C7 3.0 Bi-TDI as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eDoes it change the exhaust pipework?\u003c\/h3\u003e\n\u003cp\u003eNo. It is an electronic sound system, so the exhaust itself stays as it is.\u003c\/p\u003e\n\u003ch3\u003eWhat does it work with?\u003c\/h3\u003e\n\u003cp\u003eMilltek notes: \"V2 with 8 Selectable Sound Files\". Check this matches your current exhaust before ordering.\u003c\/p\u003e\n\u003ch3\u003eIs this a complete exhaust system?\u003c\/h3\u003e\n\u003cp\u003eNo. It is designed to be used with the system or factory parts described above, rather than as a complete exhaust on its own.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392723497345,"sku":"MIL-SSXAU668","price":852.43,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU668_1_a2a99e7c-f7e3-450e-990c-b1ee75f2ed6f.jpg?v=1791891260"},{"product_id":"milltek-cat-back-exhaust-audi-s4-3-0-supercharged-v6-b8-09-12","title":"Milltek Cat Back Exhaust Audi S4 3.0 Supercharged V6 B8 09-12","description":"\u003ch2\u003eMilltek Cat-back Exhaust for Audi S4 3.0 Supercharged V6 B8 (2009-2012) – Sharper Sound, Reduced Back Pressure\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's cat-back system for the Audi S4 3.0 Supercharged V6 B8. It replaces everything from the factory catalytic converter rearward with wider-bore pipework, a re-profiled mid-pipe and silencers tuned specifically for this platform, cutting back pressure and sharpening the exhaust note. The factory catalytic converter stays in place, so the car's emissions hardware is left as standard. It's offered in resonated EC approved, race non-resonated or resonated versions, valved or non-valved versions and 3 tailpipe finishes, so you can pick the setup that suits how the car's used.\u003c\/p\u003e\n\u003cp\u003eIt's aimed at owners who want a noticeably different sound and a genuine, if modest, flow improvement without touching anything upstream of the cat: a straightforward bolt-on that doesn't need a remap or any other supporting mods to enjoy.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Cat-back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 60.3mm (2.37\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e60.3mm (2.37\") pipework\u003c\/li\u003e\n\u003cli\u003eReplaces the standard exhaust from the catalytic converter back, so the factory cat is retained\u003c\/li\u003e\n\u003cli\u003eChoice of 3 tailpipe finishes: Cerakote Black Oval, Cerakote Black, Polished\u003c\/li\u003e\n\u003cli\u003eEC approved versions available\u003c\/li\u003e\n\u003cli\u003eValved versions available for switchable volume\u003c\/li\u003e\n\u003cli\u003eResonated (quieter) or non-resonated (louder) versions\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Supercharged V6 B8 (2009-2012)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 TFSI B8 Sportback (2010-2011)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 TFSI B8 Coupé \u0026amp; Cabriolet (S tronic) (2009-2011)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot every version fits every car in this list. Check the fitment shown for the option you select.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the Audi S4 3.0 Supercharged V6 B8.5, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-supercharged-v6-b8-5-12-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Supercharged V6 B8.5 12-16\u003c\/a\u003e; the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e; the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-rhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Right Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eThe fitting time varies by version; see the specification table for the option you choose. We recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.\u003c\/p\u003e\n\u003ch3\u003eWhat's the difference between the resonated and non-resonated versions?\u003c\/h3\u003e\n\u003cp\u003eThe resonated version adds extra silencing for a quieter, more refined tone. The non-resonated version leaves it out, so it is louder and more aggressive. Race versions are the loudest and are intended for track use.\u003c\/p\u003e\n\u003ch3\u003eShould I choose the valved or non-valved version?\u003c\/h3\u003e\n\u003cp\u003eThe valved version lets you switch between a quieter tone and the full exhaust note. Choose non-valved if you want the same sound all the time.\u003c\/p\u003e\n\u003ch3\u003eWhich tailpipe finishes are available?\u003c\/h3\u003e\n\u003cp\u003eYou can choose from: Cerakote Black Oval, Cerakote Black, Polished. The finish is cosmetic and does not change the sound.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S5 3.0 TFSI B8 Sportback?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S5 3.0 TFSI B8 Sportback as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the Audi S4 3.0 Supercharged V6 B8.5?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-supercharged-v6-b8-5-12-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Supercharged V6 B8.5 12-16\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eSome versions are EC approved; check the EC Approved line in the specification for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eNo. It fits behind the factory catalytic converter, so no software changes are needed.\u003c\/p\u003e\n\u003ch3\u003eDoes it keep the factory catalytic converter?\u003c\/h3\u003e\n\u003cp\u003eYes. It fits behind the factory catalytic converter, which stays in place.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eIt depends on the version. Milltek's fitting time for each option is shown in its specification table.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Resonated - EC Approved \/ Non-Valved \/ Cerakote Black Oval","offer_id":56392724021633,"sku":"MIL-SSXAU262","price":2140.71,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ Non-Valved \/ Cerakote Black","offer_id":56392724054401,"sku":"MIL-SSXAU556","price":2401.21,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ Non-Valved \/ Polished","offer_id":56392724087169,"sku":"MIL-SSXAU261","price":2191.8,"currency_code":"GBP","in_stock":true},{"title":"Race, Non-Resonated \/ Non-Valved \/ Cerakote Black Oval","offer_id":56392724119937,"sku":"MIL-SSXAU240","price":1910.0,"currency_code":"GBP","in_stock":true},{"title":"Race, Non-Resonated \/ Non-Valved \/ Cerakote Black","offer_id":56392724152705,"sku":"MIL-SSXAU557","price":2170.49,"currency_code":"GBP","in_stock":true},{"title":"Race, Non-Resonated \/ Non-Valved \/ Polished","offer_id":56392724185473,"sku":"MIL-SSXAU268","price":1961.08,"currency_code":"GBP","in_stock":true},{"title":"Resonated \/ Valved \/ Cerakote Black Oval","offer_id":56392724218241,"sku":"MIL-SSXAU380","price":3549.38,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU262_1.jpg?v=1791891276"},{"product_id":"milltek-cat-back-exhaust-audi-s4-3-0-supercharged-v6-b8-5-12-16","title":"Milltek Cat Back Exhaust Audi S4 3.0 Supercharged V6 B8.5 12-16","description":"\u003ch2\u003eMilltek Cat-back Exhaust for Audi S4 3.0 Supercharged V6 B8.5 (2012-2016) – Sharper Sound, Reduced Back Pressure\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's cat-back system for the Audi S4 3.0 Supercharged V6 B8.5. It replaces everything from the factory catalytic converter rearward with wider-bore pipework, a re-profiled mid-pipe and silencers tuned specifically for this platform, cutting back pressure and sharpening the exhaust note. The factory catalytic converter stays in place, so the car's emissions hardware is left as standard. It's offered in resonated EC approved, race non-resonated or resonated versions, valved or non-valved versions and 4 tailpipe finishes, so you can pick the setup that suits how the car's used.\u003c\/p\u003e\n\u003cp\u003eIt's aimed at owners who want a noticeably different sound and a genuine, if modest, flow improvement without touching anything upstream of the cat: a straightforward bolt-on that doesn't need a remap or any other supporting mods to enjoy.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Cat-back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 60.3mm (2.37\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e60.3mm (2.37\") pipework\u003c\/li\u003e\n\u003cli\u003eReplaces the standard exhaust from the catalytic converter back, so the factory cat is retained\u003c\/li\u003e\n\u003cli\u003eChoice of 4 tailpipe finishes: GT-100 Cerakote Black, GT-100 Polished, GT-100 Black, GT-100 Titanium\u003c\/li\u003e\n\u003cli\u003eEC approved versions available\u003c\/li\u003e\n\u003cli\u003eValved versions available for switchable volume\u003c\/li\u003e\n\u003cli\u003eResonated (quieter) or non-resonated (louder) versions\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Supercharged V6 B8.5 (2012-2016)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 TFSI B8.5 Sportback (2012-2016)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 TFSI B8.5 Coupé \u0026amp; Cabriolet (2011-2016)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot every version fits every car in this list. Check the fitment shown for the option you select.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the Audi S4 3.0 Supercharged V6 B8, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-supercharged-v6-b8-09-12\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Supercharged V6 B8 09-12\u003c\/a\u003e; the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e; the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-rhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Right Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eWe recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.\u003c\/p\u003e\n\u003ch3\u003eWhat's the difference between the resonated and non-resonated versions?\u003c\/h3\u003e\n\u003cp\u003eThe resonated version adds extra silencing for a quieter, more refined tone. The non-resonated version leaves it out, so it is louder and more aggressive. Race versions are the loudest and are intended for track use.\u003c\/p\u003e\n\u003ch3\u003eShould I choose the valved or non-valved version?\u003c\/h3\u003e\n\u003cp\u003eThe valved version lets you switch between a quieter tone and the full exhaust note. Choose non-valved if you want the same sound all the time.\u003c\/p\u003e\n\u003ch3\u003eWhich tailpipe finishes are available?\u003c\/h3\u003e\n\u003cp\u003eYou can choose from: GT-100 Cerakote Black, GT-100 Polished, GT-100 Black, GT-100 Titanium. The finish is cosmetic and does not change the sound.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S5 3.0 TFSI B8.5 Sportback?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S5 3.0 TFSI B8.5 Sportback as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the Audi S4 3.0 Supercharged V6 B8?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-supercharged-v6-b8-09-12\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Supercharged V6 B8 09-12\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eSome versions are EC approved; check the EC Approved line in the specification for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eNo. It fits behind the factory catalytic converter, so no software changes are needed.\u003c\/p\u003e\n\u003ch3\u003eDoes it keep the factory catalytic converter?\u003c\/h3\u003e\n\u003cp\u003eYes. It fits behind the factory catalytic converter, which stays in place.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Resonated - EC Approved \/ Non-Valved \/ GT-100 Cerakote Black","offer_id":56392724578689,"sku":"MIL-SSXAU367","price":2432.21,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ Non-Valved \/ GT-100 Polished","offer_id":56392724611457,"sku":"MIL-SSXAU366","price":2257.22,"currency_code":"GBP","in_stock":true},{"title":"Race, Non-Resonated \/ Non-Valved \/ GT-100 Cerakote Black","offer_id":56392724644225,"sku":"MIL-SSXAU375","price":2201.49,"currency_code":"GBP","in_stock":true},{"title":"Race, Non-Resonated \/ Non-Valved \/ GT-100 Polished","offer_id":56392724676993,"sku":"MIL-SSXAU376","price":2026.51,"currency_code":"GBP","in_stock":true},{"title":"Resonated \/ Valved \/ GT-100 Black","offer_id":56392724709761,"sku":"MIL-SSXAU406","price":3075.45,"currency_code":"GBP","in_stock":true},{"title":"Resonated \/ Valved \/ GT-100 Polished","offer_id":56392724742529,"sku":"MIL-SSXAU407","price":3075.51,"currency_code":"GBP","in_stock":true},{"title":"Resonated \/ Valved \/ GT-100 Titanium","offer_id":56392724775297,"sku":"MIL-SSXAU408","price":3381.75,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU367_1.jpg?v=1791891279"},{"product_id":"milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16","title":"Milltek Active Valve Control Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Non Sport Diff LHD 16+","description":"\u003ch2\u003eMilltek Active Valve Control for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Switchable Exhaust Volume\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's active valve control system for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only. It adds an electronically-operated valve to an existing Milltek system, opening a second, less restrictive path through the silencer that stays closed for a refined, near-standard tone around town and opens under load or at the press of a button for a louder, more open sound.\u003c\/p\u003e\n\u003cp\u003eIt's the option to go for if you want the flexibility to keep the car quiet for early starts and long motorway runs, then switch to the full exhaust note whenever you actually want to hear it, without swapping any hardware.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Active Valve Control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValvesonic:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi SQ5 3.0TFSI V6 Turbo (2017 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S4 3.0 GPF ONLY - Non Sport Diff models, or any model not listed above.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. This involves connecting to the car's wiring and exhaust valves, so we recommend fitting by a specialist familiar with the car's electrics.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-hjs-tuning-ece-downpipes-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek HJS Tuning ECE Downpipes Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eHow is it controlled?\u003c\/h3\u003e\n\u003cp\u003eDepending on the version, it is controlled using the car's own drive select modes or ESP button.\u003c\/p\u003e\n\u003ch3\u003eWill the car be louder all the time?\u003c\/h3\u003e\n\u003cp\u003eNo. With the valve closed the tone stays close to standard; open it when you want the full exhaust note.\u003c\/p\u003e\n\u003ch3\u003eIs this a complete exhaust system?\u003c\/h3\u003e\n\u003cp\u003eNo. It is designed to be used with the system or factory parts described above, rather than as a complete exhaust on its own.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392724939137,"sku":"MIL-SSXAU677","price":558.86,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU677_1_f92f9d43-b4f5-4b38-a281-604d4f12a84a.jpg?v=1791891271"},{"product_id":"milltek-hjs-tuning-ece-downpipes-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16","title":"Milltek HJS Tuning ECE Downpipes Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Non Sport Diff LHD 16+","description":"\u003ch2\u003eMilltek HJS Tuning ECE Downpipes for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Improved Flow, Sports Catalyst\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's HJS Tuning ECE downpipe set for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only. These replace the factory downpipes with HJS high-flow sports catalysts that carry full ECE type-approval, so you get a genuine flow improvement over the restrictive factory units without taking the car outside emissions compliance.\u003c\/p\u003e\n\u003cp\u003eThey're aimed at drivers who want more from the downpipes than the standard units allow, but need the car to stay legally usable on the road and pass an emissions test, which a straight de-cat pipe won't do.\u003c\/p\u003e\n\u003cp\u003eBecause they're type-approved, these can be run on a car that's used on the road, unlike a straight de-cat pipe.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e HJS Tuning ECE Downpipes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eHigh-flow sports catalyst flows better than the dense factory unit while still treating exhaust gases\u003c\/li\u003e\n\u003cli\u003eEC approved\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S4 3.0 GPF ONLY - Non Sport Diff models, or any model not listed above.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. Before ordering, note: Fits with OE and Milltek Sport Cat back Systems (EC Approved). This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Active Valve Control Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eEvery version of this part is listed by Milltek as EC approved.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eA suitable remap is strongly recommended, as the engine management needs to account for the change in flow and sensor readings. Speak to your tuner before fitting.\u003c\/p\u003e\n\u003ch3\u003eCan I use it with my standard exhaust?\u003c\/h3\u003e\n\u003cp\u003eIt depends on the version. Some are made for the factory (OE) system and others for the Milltek cat-back, so check the notes for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eHow is a sports cat different from a de-cat?\u003c\/h3\u003e\n\u003cp\u003eA sports cat still contains a catalyst, just a less dense one that flows better than the factory unit. A de-cat removes the catalyst completely.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392726086017,"sku":"MIL-SSXAU725","price":3481.92,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU725_1_4f18c232-1ea9-4e51-aa29-765ba2f73e48.jpg?v=1791891281"},{"product_id":"milltek-sports-cat-downpipe-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16","title":"Milltek Sports Cat Downpipe Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Non Sport Diff LHD 16+","description":"\u003ch2\u003eMilltek Hi-Flow Sports Cat \u0026amp; Downpipe for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Improved Flow, Sports Catalyst\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's large-bore downpipe with hi-flow sports cat for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only. It replaces the restrictive factory downpipe with a larger-bore pipe fitted with a high-flow sports catalyst in place of the standard unit, using a less dense substrate that flows significantly better than the factory cat while still treating the exhaust gases passing through it.\u003c\/p\u003e\n\u003cp\u003eIt sits between a stock downpipe and a full de-cat: a genuine flow gain suited to a Stage 1 or Stage 2 remap, without giving up the catalyst entirely the way a de-cat pipe does.\u003c\/p\u003e\n\u003cp\u003eIn the UK, a replacement catalyst on a car first registered from 1 March 2001 needs ECE R103 type-approval to be road legal, so check the EC Approved line in the specification for the version you choose.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Hi-Flow Sports Cat and Downpipe\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eHigh-flow sports catalyst flows better than the dense factory unit while still treating exhaust gases\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S4 3.0 GPF ONLY - Non Sport Diff models, or any model not listed above.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. Before ordering, note: 200 Cell HJS High Flow Sport Cat, fits with OE and Milltek Sport Cat back Systems. This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Active Valve Control Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eMilltek lists this as a race part without EC approval, so it is intended for off-road and competition use.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eA suitable remap is strongly recommended, as the engine management needs to account for the change in flow and sensor readings. Speak to your tuner before fitting.\u003c\/p\u003e\n\u003ch3\u003eCan I use it with my standard exhaust?\u003c\/h3\u003e\n\u003cp\u003eIt depends on the version. Some are made for the factory (OE) system and others for the Milltek cat-back, so check the notes for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eHow is a sports cat different from a de-cat?\u003c\/h3\u003e\n\u003cp\u003eA sports cat still contains a catalyst, just a less dense one that flows better than the factory unit. A de-cat removes the catalyst completely.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392726446465,"sku":"MIL-SSXAU673","price":2330.42,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU673_1.jpg?v=1791891287"},{"product_id":"milltek-cat-replacement-pipe-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16","title":"Milltek Cat Replacement Pipe Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Non Sport Diff LHD 16+","description":"\u003ch2\u003eMilltek Cat Replacement Pipe for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Maximum Flow, Motorsport Use\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's large-bore downpipe and de-cat for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only. It replaces the factory downpipe with a larger-bore pipe and removes the catalytic converter entirely, clearing the single most restrictive point in the exhaust for the biggest flow gain available at this position in the system. It's usually fitted alongside a Stage 2 remap, since the ECU needs to be told to expect the different readings the lambda sensors give once the cat's gone.\u003c\/p\u003e\n\u003cp\u003eIt's built for owners already committed to a serious power upgrade rather than a casual bolt-on, so pair it with the matching Milltek cat-back system for the full effect.\u003c\/p\u003e\n\u003cp\u003eBecause it removes the cat, it's intended for off-road and competition use. A de-catted car will fail an MOT emissions test and isn't legal to use on UK roads.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Cat Replacement Pipe\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eRemoves the factory catalyst for maximum flow (off-road and competition use only)\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S4 3.0 GPF ONLY - Non Sport Diff models, or any model not listed above.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. Before ordering, note: Cat Bypass, fits with OE and Milltek Sport Cat back Systems. This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Active Valve Control Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eNo. Removing the catalyst means the car will fail an MOT emissions test, so it is for off-road and competition use only.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eA suitable remap is strongly recommended, as the engine management needs to account for the change in flow and sensor readings. Speak to your tuner before fitting.\u003c\/p\u003e\n\u003ch3\u003eCan I use it with my standard exhaust?\u003c\/h3\u003e\n\u003cp\u003eIt depends on the version. Some are made for the factory (OE) system and others for the Milltek cat-back, so check the notes for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eWill removing the cat cause a warning light?\u003c\/h3\u003e\n\u003cp\u003eWithout suitable software it is likely to, as the ECU expects the readings a working catalyst gives. This is why Milltek pairs it with a remap.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392727003521,"sku":"MIL-SSXAU674","price":653.23,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU674_1_c2c1324d-64b4-4d8b-ac90-55afa6574797.jpg?v=1791891291"},{"product_id":"milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16","title":"Milltek Cat Back Exhaust Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Non Sport Diff LHD 16+","description":"\u003ch2\u003eMilltek Cat-back Exhaust for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Sharper Sound, Reduced Back Pressure\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's cat-back system for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only. It replaces everything from the factory catalytic converter rearward with wider-bore pipework, a re-profiled mid-pipe and silencers tuned specifically for this platform, cutting back pressure and sharpening the exhaust note. The factory catalytic converter stays in place, so the car's emissions hardware is left as standard. It's offered in non-resonated or resonated EC approved versions and 11 tailpipe finishes, so you can pick the setup that suits how the car's used.\u003c\/p\u003e\n\u003cp\u003eIt's aimed at owners who want a noticeably different sound and a genuine, if modest, flow improvement without touching anything upstream of the cat: a straightforward bolt-on that doesn't need a remap or any other supporting mods to enjoy.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Cat-back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eReplaces the standard exhaust from the catalytic converter back, so the factory cat is retained\u003c\/li\u003e\n\u003cli\u003eChoice of 11 tailpipe finishes: Cerakote Black Oval, GT-100 Burnt Titanium, GT-100 Cerakote Black, GT-100 Polished, GT-100 Titanium, GT-90 Burnt Titanium, GT-90 Cerakote Black, GT-90 Polished and more\u003c\/li\u003e\n\u003cli\u003eEC approved versions available\u003c\/li\u003e\n\u003cli\u003eResonated (quieter) or non-resonated (louder) versions\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot every version fits every car in this list. Check the fitment shown for the option you select.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-rhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Right Hand Drive Cars 16+\u003c\/a\u003e; the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Sport Diff \u0026amp; Without Brace Bars) - Left Hand Drive Cars 16+\u003c\/a\u003e; the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-rhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Sport Diff \u0026amp; Without Brace Bars) - Right Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. We recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Active Valve Control Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-hjs-tuning-ece-downpipes-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek HJS Tuning ECE Downpipes Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWhat's the difference between the resonated and non-resonated versions?\u003c\/h3\u003e\n\u003cp\u003eThe resonated version adds extra silencing for a quieter, more refined tone. The non-resonated version leaves it out, so it is louder and more aggressive.\u003c\/p\u003e\n\u003ch3\u003eWhich tailpipe finishes are available?\u003c\/h3\u003e\n\u003cp\u003eYou can choose from: Cerakote Black Oval, GT-100 Burnt Titanium, GT-100 Cerakote Black, GT-100 Polished, GT-100 Titanium, GT-90 Burnt Titanium, GT-90 Cerakote Black, GT-90 Polished, GT-90 Titanium, JET-100 Carbon Fibre, Polished Oval. The finish is cosmetic and does not change the sound.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-rhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Right Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eSome versions are EC approved; check the EC Approved line in the specification for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eNo. It fits behind the factory catalytic converter, so no software changes are needed.\u003c\/p\u003e\n\u003ch3\u003eDoes it keep the factory catalytic converter?\u003c\/h3\u003e\n\u003cp\u003eYes. It fits behind the factory catalytic converter, which stays in place.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Non-Resonated \/ Cerakote Black Oval","offer_id":56392727167361,"sku":"MIL-SSXAU656","price":2751.46,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Burnt Titanium","offer_id":56392727200129,"sku":"MIL-SSXAU653","price":3037.97,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Cerakote Black","offer_id":56392727232897,"sku":"MIL-SSXAU651","price":2415.4,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Polished","offer_id":56392727265665,"sku":"MIL-SSXAU650","price":2415.46,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Titanium","offer_id":56392727298433,"sku":"MIL-SSXAU652","price":2721.7,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-90 Burnt Titanium","offer_id":56392727331201,"sku":"MIL-SSXAU654","price":3044.5,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-90 Cerakote Black","offer_id":56392727363969,"sku":"MIL-SSXAU658","price":2591.03,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-90 Polished","offer_id":56392727396737,"sku":"MIL-SSXAU655","price":2420.7,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-90 Titanium","offer_id":56392727429505,"sku":"MIL-SSXAU657","price":2866.11,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ JET-100 Carbon Fibre","offer_id":56392727462273,"sku":"MIL-SSXAU724","price":2669.78,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ Polished Oval","offer_id":56392727495041,"sku":"MIL-SSXAU659","price":2579.6,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Cerakote Black","offer_id":56392727527809,"sku":"MIL-SSXAU641","price":2584.85,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ Cerakote Black Oval","offer_id":56392727560577,"sku":"MIL-SSXAU649","price":2920.91,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Burnt Titanium","offer_id":56392727593345,"sku":"MIL-SSXAU643","price":3207.42,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Polished","offer_id":56392727626113,"sku":"MIL-SSXAU640","price":2584.91,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Titanium","offer_id":56392727658881,"sku":"MIL-SSXAU642","price":2891.15,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-90 Burnt Titanium","offer_id":56392727691649,"sku":"MIL-SSXAU647","price":3213.95,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-90 Cerakote Black","offer_id":56392727724417,"sku":"MIL-SSXAU645","price":2760.48,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-90 Polished","offer_id":56392727757185,"sku":"MIL-SSXAU644","price":2590.16,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-90 Titanium","offer_id":56392727789953,"sku":"MIL-SSXAU646","price":3035.57,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ JET-100 Carbon Fibre","offer_id":56392727822721,"sku":"MIL-SSXAU723","price":2839.23,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ Polished Oval","offer_id":56392727855489,"sku":"MIL-SSXAU648","price":2749.05,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU656_1_6a8fb214-d2be-4035-beea-0c3c4bb19845.jpg?v=1791891329"},{"product_id":"milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-rhd-16","title":"Milltek Active Valve Control Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Non Sport Diff RHD 16+","description":"\u003ch2\u003eMilltek Active Valve Control for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Switchable Exhaust Volume\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's active valve control system for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only. It adds an electronically-operated valve to an existing Milltek system, opening a second, less restrictive path through the silencer that stays closed for a refined, near-standard tone around town and opens under load or at the press of a button for a louder, more open sound.\u003c\/p\u003e\n\u003cp\u003eIt's the option to go for if you want the flexibility to keep the car quiet for early starts and long motorway runs, then switch to the full exhaust note whenever you actually want to hear it, without swapping any hardware.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Active Valve Control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValvesonic:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi SQ5 3.0TFSI V6 Turbo (2017 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S4 3.0 GPF ONLY - Non Sport Diff models, or any model not listed above.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. This involves connecting to the car's wiring and exhaust valves, so we recommend fitting by a specialist familiar with the car's electrics.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-hjs-tuning-ece-downpipes-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek HJS Tuning ECE Downpipes Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eHow is it controlled?\u003c\/h3\u003e\n\u003cp\u003eDepending on the version, it is controlled using the car's own drive select modes or ESP button.\u003c\/p\u003e\n\u003ch3\u003eWill the car be louder all the time?\u003c\/h3\u003e\n\u003cp\u003eNo. With the valve closed the tone stays close to standard; open it when you want the full exhaust note.\u003c\/p\u003e\n\u003ch3\u003eIs this a complete exhaust system?\u003c\/h3\u003e\n\u003cp\u003eNo. It is designed to be used with the system or factory parts described above, rather than as a complete exhaust on its own.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392728215937,"sku":"MIL-SSXAU677","price":558.86,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU677_1_821c6f3a-6ab1-4c92-bfb4-29c8b778605b.jpg?v=1791891296"},{"product_id":"milltek-hjs-tuning-ece-downpipes-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-rhd-16","title":"Milltek HJS Tuning ECE Downpipes Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Non Sport Diff RHD 16+","description":"\u003ch2\u003eMilltek HJS Tuning ECE Downpipes for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Improved Flow, Sports Catalyst\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's HJS Tuning ECE downpipe set for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only. These replace the factory downpipes with HJS high-flow sports catalysts that carry full ECE type-approval, so you get a genuine flow improvement over the restrictive factory units without taking the car outside emissions compliance.\u003c\/p\u003e\n\u003cp\u003eThey're aimed at drivers who want more from the downpipes than the standard units allow, but need the car to stay legally usable on the road and pass an emissions test, which a straight de-cat pipe won't do.\u003c\/p\u003e\n\u003cp\u003eBecause they're type-approved, these can be run on a car that's used on the road, unlike a straight de-cat pipe.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e HJS Tuning ECE Downpipes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eHigh-flow sports catalyst flows better than the dense factory unit while still treating exhaust gases\u003c\/li\u003e\n\u003cli\u003eEC approved\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S4 3.0 GPF ONLY - Non Sport Diff models, or any model not listed above.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. Before ordering, note: Fits with OE and Milltek Sport Cat back Systems (EC Approved). This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Active Valve Control Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eEvery version of this part is listed by Milltek as EC approved.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eA suitable remap is strongly recommended, as the engine management needs to account for the change in flow and sensor readings. Speak to your tuner before fitting.\u003c\/p\u003e\n\u003ch3\u003eCan I use it with my standard exhaust?\u003c\/h3\u003e\n\u003cp\u003eIt depends on the version. Some are made for the factory (OE) system and others for the Milltek cat-back, so check the notes for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eHow is a sports cat different from a de-cat?\u003c\/h3\u003e\n\u003cp\u003eA sports cat still contains a catalyst, just a less dense one that flows better than the factory unit. A de-cat removes the catalyst completely.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392728510849,"sku":"MIL-SSXAU725","price":3481.92,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU725_1_7222d4ef-c6d7-4ab6-9a18-5a520613b444.jpg?v=1791891301"},{"product_id":"milltek-sports-cat-downpipe-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-rhd-16","title":"Milltek Sports Cat Downpipe Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Non Sport Diff RHD 16+","description":"\u003ch2\u003eMilltek Hi-Flow Sports Cat \u0026amp; Downpipe for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Improved Flow, Sports Catalyst\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's large-bore downpipe with hi-flow sports cat for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only. It replaces the restrictive factory downpipe with a larger-bore pipe fitted with a high-flow sports catalyst in place of the standard unit, using a less dense substrate that flows significantly better than the factory cat while still treating the exhaust gases passing through it.\u003c\/p\u003e\n\u003cp\u003eIt sits between a stock downpipe and a full de-cat: a genuine flow gain suited to a Stage 1 or Stage 2 remap, without giving up the catalyst entirely the way a de-cat pipe does.\u003c\/p\u003e\n\u003cp\u003eIn the UK, a replacement catalyst on a car first registered from 1 March 2001 needs ECE R103 type-approval to be road legal, so check the EC Approved line in the specification for the version you choose.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Hi-Flow Sports Cat and Downpipe\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eHigh-flow sports catalyst flows better than the dense factory unit while still treating exhaust gases\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S4 3.0 GPF ONLY - Non Sport Diff models, or any model not listed above.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. Before ordering, note: 200 Cell HJS High Flow Sport Cat, fits with OE and Milltek Sport Cat back Systems. This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Active Valve Control Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eMilltek lists this as a race part without EC approval, so it is intended for off-road and competition use.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eA suitable remap is strongly recommended, as the engine management needs to account for the change in flow and sensor readings. Speak to your tuner before fitting.\u003c\/p\u003e\n\u003ch3\u003eCan I use it with my standard exhaust?\u003c\/h3\u003e\n\u003cp\u003eIt depends on the version. Some are made for the factory (OE) system and others for the Milltek cat-back, so check the notes for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eHow is a sports cat different from a de-cat?\u003c\/h3\u003e\n\u003cp\u003eA sports cat still contains a catalyst, just a less dense one that flows better than the factory unit. A de-cat removes the catalyst completely.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392728838529,"sku":"MIL-SSXAU673","price":2330.42,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU673_1_ccc3cb39-915a-4c9f-866a-766415404405.jpg?v=1791891302"},{"product_id":"milltek-cat-replacement-pipe-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-rhd-16","title":"Milltek Cat Replacement Pipe Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Non Sport Diff RHD 16+","description":"\u003ch2\u003eMilltek Cat Replacement Pipe for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Maximum Flow, Motorsport Use\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's large-bore downpipe and de-cat for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only. It replaces the factory downpipe with a larger-bore pipe and removes the catalytic converter entirely, clearing the single most restrictive point in the exhaust for the biggest flow gain available at this position in the system. It's usually fitted alongside a Stage 2 remap, since the ECU needs to be told to expect the different readings the lambda sensors give once the cat's gone.\u003c\/p\u003e\n\u003cp\u003eIt's built for owners already committed to a serious power upgrade rather than a casual bolt-on, so pair it with the matching Milltek cat-back system for the full effect.\u003c\/p\u003e\n\u003cp\u003eBecause it removes the cat, it's intended for off-road and competition use. A de-catted car will fail an MOT emissions test and isn't legal to use on UK roads.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Cat Replacement Pipe\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eRemoves the factory catalyst for maximum flow (off-road and competition use only)\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S4 3.0 GPF ONLY - Non Sport Diff models, or any model not listed above.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. Before ordering, note: Cat Bypass, fits with OE and Milltek Sport Cat back Systems. This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Active Valve Control Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eNo. Removing the catalyst means the car will fail an MOT emissions test, so it is for off-road and competition use only.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eA suitable remap is strongly recommended, as the engine management needs to account for the change in flow and sensor readings. Speak to your tuner before fitting.\u003c\/p\u003e\n\u003ch3\u003eCan I use it with my standard exhaust?\u003c\/h3\u003e\n\u003cp\u003eIt depends on the version. Some are made for the factory (OE) system and others for the Milltek cat-back, so check the notes for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eWill removing the cat cause a warning light?\u003c\/h3\u003e\n\u003cp\u003eWithout suitable software it is likely to, as the ECU expects the readings a working catalyst gives. This is why Milltek pairs it with a remap.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392728871297,"sku":"MIL-SSXAU674","price":653.23,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU674_1_7c957969-72d9-4c5f-a3f8-d972c7667240.jpg?v=1791891305"},{"product_id":"milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-lhd-16","title":"Milltek Active Valve Control Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Sport Diff without Brace Bars LHD 16+","description":"\u003ch2\u003eMilltek Active Valve Control for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Switchable Exhaust Volume\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's active valve control system for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only. It adds an electronically-operated valve to an existing Milltek system, opening a second, less restrictive path through the silencer that stays closed for a refined, near-standard tone around town and opens under load or at the press of a button for a louder, more open sound.\u003c\/p\u003e\n\u003cp\u003eIt's the option to go for if you want the flexibility to keep the car quiet for early starts and long motorway runs, then switch to the full exhaust note whenever you actually want to hear it, without swapping any hardware.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Active Valve Control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValvesonic:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi SQ5 3.0TFSI V6 Turbo (2017 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S4 3.0 GPF ONLY - Non Sport Diff models, or any model not listed above.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. This involves connecting to the car's wiring and exhaust valves, so we recommend fitting by a specialist familiar with the car's electrics.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-hjs-tuning-ece-downpipes-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek HJS Tuning ECE Downpipes Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eHow is it controlled?\u003c\/h3\u003e\n\u003cp\u003eDepending on the version, it is controlled using the car's own drive select modes or ESP button.\u003c\/p\u003e\n\u003ch3\u003eWill the car be louder all the time?\u003c\/h3\u003e\n\u003cp\u003eNo. With the valve closed the tone stays close to standard; open it when you want the full exhaust note.\u003c\/p\u003e\n\u003ch3\u003eIs this a complete exhaust system?\u003c\/h3\u003e\n\u003cp\u003eNo. It is designed to be used with the system or factory parts described above, rather than as a complete exhaust on its own.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392728904065,"sku":"MIL-SSXAU677","price":558.86,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU677_1_6b4de24d-2b2e-43b1-8dac-4e33a6408065.jpg?v=1791891312"},{"product_id":"milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-rhd-16","title":"Milltek Cat Back Exhaust Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Non Sport Diff RHD 16+","description":"\u003ch2\u003eMilltek Cat-back Exhaust for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards) – Sharper Sound, Reduced Back Pressure\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's cat-back system for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only. It replaces everything from the factory catalytic converter rearward with wider-bore pipework, a re-profiled mid-pipe and silencers tuned specifically for this platform, cutting back pressure and sharpening the exhaust note. The factory catalytic converter stays in place, so the car's emissions hardware is left as standard. It's offered in non-resonated or resonated EC approved versions and 11 tailpipe finishes, so you can pick the setup that suits how the car's used.\u003c\/p\u003e\n\u003cp\u003eIt's aimed at owners who want a noticeably different sound and a genuine, if modest, flow improvement without touching anything upstream of the cat: a straightforward bolt-on that doesn't need a remap or any other supporting mods to enjoy.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Cat-back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eReplaces the standard exhaust from the catalytic converter back, so the factory cat is retained\u003c\/li\u003e\n\u003cli\u003eChoice of 11 tailpipe finishes: Cerakote Black Oval, GT-100 Burnt Titanium, GT-100 Cerakote Black, GT-100 Polished, GT-100 Titanium, GT-90 Burnt Titanium, GT-90 Cerakote Black, GT-90 Polished and more\u003c\/li\u003e\n\u003cli\u003eEC approved versions available\u003c\/li\u003e\n\u003cli\u003eResonated (quieter) or non-resonated (louder) versions\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e; the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-rhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Sport Diff \u0026amp; Without Brace Bars) - Right Hand Drive Cars 16+\u003c\/a\u003e; the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Sport Diff \u0026amp; Without Brace Bars) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eWe recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.\u003c\/p\u003e\n\u003ch3\u003eWhat's the difference between the resonated and non-resonated versions?\u003c\/h3\u003e\n\u003cp\u003eThe resonated version adds extra silencing for a quieter, more refined tone. The non-resonated version leaves it out, so it is louder and more aggressive.\u003c\/p\u003e\n\u003ch3\u003eWhich tailpipe finishes are available?\u003c\/h3\u003e\n\u003cp\u003eYou can choose from: Cerakote Black Oval, GT-100 Burnt Titanium, GT-100 Cerakote Black, GT-100 Polished, GT-100 Titanium, GT-90 Burnt Titanium, GT-90 Cerakote Black, GT-90 Polished, GT-90 Titanium, JET-100 Carbon Fibre, Polished Oval. The finish is cosmetic and does not change the sound.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eSome versions are EC approved; check the EC Approved line in the specification for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eNo. It fits behind the factory catalytic converter, so no software changes are needed.\u003c\/p\u003e\n\u003ch3\u003eDoes it keep the factory catalytic converter?\u003c\/h3\u003e\n\u003cp\u003eYes. It fits behind the factory catalytic converter, which stays in place.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Non-Resonated \/ Cerakote Black Oval","offer_id":56392728936833,"sku":"MIL-SSXAU1086","price":2751.46,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Burnt Titanium","offer_id":56392728969601,"sku":"MIL-SSXAU1083","price":3037.97,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Cerakote Black","offer_id":56392729002369,"sku":"MIL-SSXAU1081","price":2415.4,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Polished","offer_id":56392729035137,"sku":"MIL-SSXAU1080","price":2415.46,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Titanium","offer_id":56392729067905,"sku":"MIL-SSXAU1082","price":2721.7,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-90 Burnt Titanium","offer_id":56392729100673,"sku":"MIL-SSXAU1084","price":3044.5,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-90 Cerakote Black","offer_id":56392729133441,"sku":"MIL-SSXAU1088","price":2591.03,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-90 Polished","offer_id":56392729166209,"sku":"MIL-SSXAU1085","price":2420.7,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-90 Titanium","offer_id":56392729198977,"sku":"MIL-SSXAU1087","price":2866.11,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ JET-100 Carbon Fibre","offer_id":56392729231745,"sku":"MIL-SSXAU1090","price":2669.78,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ Polished Oval","offer_id":56392729264513,"sku":"MIL-SSXAU1106","price":2579.6,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Cerakote Black","offer_id":56392729297281,"sku":"MIL-SSXAU1071","price":2584.85,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ Cerakote Black Oval","offer_id":56392729330049,"sku":"MIL-SSXAU1079","price":2920.91,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Burnt Titanium","offer_id":56392729362817,"sku":"MIL-SSXAU1073","price":3207.42,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Polished","offer_id":56392729395585,"sku":"MIL-SSXAU1070","price":2584.91,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Titanium","offer_id":56392729428353,"sku":"MIL-SSXAU1072","price":2891.15,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-90 Burnt Titanium","offer_id":56392729461121,"sku":"MIL-SSXAU1077","price":3213.95,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-90 Cerakote Black","offer_id":56392729493889,"sku":"MIL-SSXAU1075","price":2760.48,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-90 Polished","offer_id":56392729526657,"sku":"MIL-SSXAU1074","price":2590.16,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-90 Titanium","offer_id":56392729559425,"sku":"MIL-SSXAU1076","price":3035.57,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ JET-100 Carbon Fibre","offer_id":56392729592193,"sku":"MIL-SSXAU1089","price":2839.23,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ Polished Oval","offer_id":56392729624961,"sku":"MIL-SSXAU1078","price":2749.05,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU1086_1.jpg?v=1791891351"},{"product_id":"milltek-hjs-tuning-ece-downpipes-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-lhd-16","title":"Milltek HJS Tuning ECE Downpipes Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Sport Diff without Brace Bars LHD 16+","description":"\u003ch2\u003eMilltek HJS Tuning ECE Downpipes for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Improved Flow, Sports Catalyst\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's HJS Tuning ECE downpipe set for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only. These replace the factory downpipes with HJS high-flow sports catalysts that carry full ECE type-approval, so you get a genuine flow improvement over the restrictive factory units without taking the car outside emissions compliance.\u003c\/p\u003e\n\u003cp\u003eThey're aimed at drivers who want more from the downpipes than the standard units allow, but need the car to stay legally usable on the road and pass an emissions test, which a straight de-cat pipe won't do.\u003c\/p\u003e\n\u003cp\u003eBecause they're type-approved, these can be run on a car that's used on the road, unlike a straight de-cat pipe.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e HJS Tuning ECE Downpipes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eHigh-flow sports catalyst flows better than the dense factory unit while still treating exhaust gases\u003c\/li\u003e\n\u003cli\u003eEC approved\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S4 3.0 GPF ONLY - Non Sport Diff models, or any model not listed above.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. Before ordering, note: Fits with OE and Milltek Sport Cat back Systems (EC Approved). This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Active Valve Control Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eEvery version of this part is listed by Milltek as EC approved.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eA suitable remap is strongly recommended, as the engine management needs to account for the change in flow and sensor readings. Speak to your tuner before fitting.\u003c\/p\u003e\n\u003ch3\u003eCan I use it with my standard exhaust?\u003c\/h3\u003e\n\u003cp\u003eIt depends on the version. Some are made for the factory (OE) system and others for the Milltek cat-back, so check the notes for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eHow is a sports cat different from a de-cat?\u003c\/h3\u003e\n\u003cp\u003eA sports cat still contains a catalyst, just a less dense one that flows better than the factory unit. A de-cat removes the catalyst completely.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392729657729,"sku":"MIL-SSXAU725","price":3481.92,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU725_1.jpg?v=1791891315"},{"product_id":"milltek-sports-cat-downpipe-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-lhd-16","title":"Milltek Sports Cat Downpipe Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Sport Diff without Brace Bars LHD 16+","description":"\u003ch2\u003eMilltek Hi-Flow Sports Cat \u0026amp; Downpipe for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Improved Flow, Sports Catalyst\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's large-bore downpipe with hi-flow sports cat for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only. It replaces the restrictive factory downpipe with a larger-bore pipe fitted with a high-flow sports catalyst in place of the standard unit, using a less dense substrate that flows significantly better than the factory cat while still treating the exhaust gases passing through it.\u003c\/p\u003e\n\u003cp\u003eIt sits between a stock downpipe and a full de-cat: a genuine flow gain suited to a Stage 1 or Stage 2 remap, without giving up the catalyst entirely the way a de-cat pipe does.\u003c\/p\u003e\n\u003cp\u003eIn the UK, a replacement catalyst on a car first registered from 1 March 2001 needs ECE R103 type-approval to be road legal, so check the EC Approved line in the specification for the version you choose.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Hi-Flow Sports Cat and Downpipe\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eHigh-flow sports catalyst flows better than the dense factory unit while still treating exhaust gases\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S4 3.0 GPF ONLY - Non Sport Diff models, or any model not listed above.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. Before ordering, note: 200 Cell HJS High Flow Sport Cat, fits with OE and Milltek Sport Cat back Systems. This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Active Valve Control Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eMilltek lists this as a race part without EC approval, so it is intended for off-road and competition use.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eA suitable remap is strongly recommended, as the engine management needs to account for the change in flow and sensor readings. Speak to your tuner before fitting.\u003c\/p\u003e\n\u003ch3\u003eCan I use it with my standard exhaust?\u003c\/h3\u003e\n\u003cp\u003eIt depends on the version. Some are made for the factory (OE) system and others for the Milltek cat-back, so check the notes for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eHow is a sports cat different from a de-cat?\u003c\/h3\u003e\n\u003cp\u003eA sports cat still contains a catalyst, just a less dense one that flows better than the factory unit. A de-cat removes the catalyst completely.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392729756033,"sku":"MIL-SSXAU673","price":2330.42,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU673_1_2bcf5012-ee7b-4c6a-bb23-43c32355908c.jpg?v=1791891322"},{"product_id":"milltek-cat-replacement-pipe-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-lhd-16","title":"Milltek Cat Replacement Pipe Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Sport Diff without Brace Bars LHD 16+","description":"\u003ch2\u003eMilltek Cat Replacement Pipe for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Maximum Flow, Motorsport Use\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's large-bore downpipe and de-cat for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only. It replaces the factory downpipe with a larger-bore pipe and removes the catalytic converter entirely, clearing the single most restrictive point in the exhaust for the biggest flow gain available at this position in the system. It's usually fitted alongside a Stage 2 remap, since the ECU needs to be told to expect the different readings the lambda sensors give once the cat's gone.\u003c\/p\u003e\n\u003cp\u003eIt's built for owners already committed to a serious power upgrade rather than a casual bolt-on, so pair it with the matching Milltek cat-back system for the full effect.\u003c\/p\u003e\n\u003cp\u003eBecause it removes the cat, it's intended for off-road and competition use. A de-catted car will fail an MOT emissions test and isn't legal to use on UK roads.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Cat Replacement Pipe\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eRemoves the factory catalyst for maximum flow (off-road and competition use only)\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S4 3.0 GPF ONLY - Non Sport Diff models, or any model not listed above.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. Before ordering, note: Cat Bypass, fits with OE and Milltek Sport Cat back Systems. This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Active Valve Control Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eNo. Removing the catalyst means the car will fail an MOT emissions test, so it is for off-road and competition use only.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eA suitable remap is strongly recommended, as the engine management needs to account for the change in flow and sensor readings. Speak to your tuner before fitting.\u003c\/p\u003e\n\u003ch3\u003eCan I use it with my standard exhaust?\u003c\/h3\u003e\n\u003cp\u003eIt depends on the version. Some are made for the factory (OE) system and others for the Milltek cat-back, so check the notes for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eWill removing the cat cause a warning light?\u003c\/h3\u003e\n\u003cp\u003eWithout suitable software it is likely to, as the ECU expects the readings a working catalyst gives. This is why Milltek pairs it with a remap.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392729788801,"sku":"MIL-SSXAU674","price":653.23,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU674_1_ea28cf42-297e-4b0a-8064-ff4ec05ab3e9.jpg?v=1791891326"},{"product_id":"milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-lhd-16","title":"Milltek Cat Back Exhaust Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Sport Diff without Brace Bars LHD 16+","description":"\u003ch2\u003eMilltek Cat-back Exhaust for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards) – Sharper Sound, Reduced Back Pressure\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's cat-back system for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only. It replaces everything from the factory catalytic converter rearward with wider-bore pipework, a re-profiled mid-pipe and silencers tuned specifically for this platform, cutting back pressure and sharpening the exhaust note. The factory catalytic converter stays in place, so the car's emissions hardware is left as standard. It's offered in non-resonated, resonated or resonated EC approved versions and 7 tailpipe finishes, so you can pick the setup that suits how the car's used.\u003c\/p\u003e\n\u003cp\u003eIt's aimed at owners who want a noticeably different sound and a genuine, if modest, flow improvement without touching anything upstream of the cat: a straightforward bolt-on that doesn't need a remap or any other supporting mods to enjoy.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Cat-back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eReplaces the standard exhaust from the catalytic converter back, so the factory cat is retained\u003c\/li\u003e\n\u003cli\u003eChoice of 7 tailpipe finishes: Cerakote Black Oval, GT-100 Burnt Titanium, GT-100 Cerakote Black, GT-100 Polished, GT-100 Titanium, JET-100 Carbon Fibre, Polished Oval\u003c\/li\u003e\n\u003cli\u003eEC approved versions available\u003c\/li\u003e\n\u003cli\u003eResonated (quieter) or non-resonated (louder) versions\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-rhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Sport Diff \u0026amp; Without Brace Bars) - Right Hand Drive Cars 16+\u003c\/a\u003e; the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e; the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-rhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Right Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. We recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.\u003c\/p\u003e\n\u003ch3\u003eWhat's the difference between the resonated and non-resonated versions?\u003c\/h3\u003e\n\u003cp\u003eThe resonated version adds extra silencing for a quieter, more refined tone. The non-resonated version leaves it out, so it is louder and more aggressive.\u003c\/p\u003e\n\u003ch3\u003eWhich tailpipe finishes are available?\u003c\/h3\u003e\n\u003cp\u003eYou can choose from: Cerakote Black Oval, GT-100 Burnt Titanium, GT-100 Cerakote Black, GT-100 Polished, GT-100 Titanium, JET-100 Carbon Fibre, Polished Oval. The finish is cosmetic and does not change the sound.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Left Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Left Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-rhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Sport Diff \u0026amp; Without Brace Bars) - Right Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eSome versions are EC approved; check the EC Approved line in the specification for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eNo. It fits behind the factory catalytic converter, so no software changes are needed.\u003c\/p\u003e\n\u003ch3\u003eDoes it keep the factory catalytic converter?\u003c\/h3\u003e\n\u003cp\u003eYes. It fits behind the factory catalytic converter, which stays in place.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Non-Resonated \/ Cerakote Black Oval","offer_id":56392729821569,"sku":"MIL-SSXAU705","price":2751.46,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Burnt Titanium","offer_id":56392729854337,"sku":"MIL-SSXAU703","price":3037.97,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Cerakote Black","offer_id":56392729887105,"sku":"MIL-SSXAU701","price":2415.4,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Polished","offer_id":56392729919873,"sku":"MIL-SSXAU700","price":2415.46,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Titanium","offer_id":56392729952641,"sku":"MIL-SSXAU702","price":2721.7,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ JET-100 Carbon Fibre","offer_id":56392729985409,"sku":"MIL-SSXAU722","price":2669.78,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ Polished Oval","offer_id":56392730018177,"sku":"MIL-SSXAU704","price":2579.6,"currency_code":"GBP","in_stock":true},{"title":"Resonated \/ JET-100 Carbon Fibre","offer_id":56392730050945,"sku":"MIL-SSXAU721","price":2839.23,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ Cerakote Black Oval","offer_id":56392730083713,"sku":"MIL-SSXAU699","price":2920.91,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Burnt Titanium","offer_id":56392730116481,"sku":"MIL-SSXAU697","price":3207.42,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Cerakote Black","offer_id":56392730149249,"sku":"MIL-SSXAU695","price":2584.85,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Polished","offer_id":56392730182017,"sku":"MIL-SSXAU694","price":2584.91,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Titanium","offer_id":56392730214785,"sku":"MIL-SSXAU696","price":2891.15,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ Polished Oval","offer_id":56392730247553,"sku":"MIL-SSXAU698","price":2749.05,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU705_1_a2b050f2-18a6-4461-8ed0-707ab8fc92ca.jpg?v=1791891357"},{"product_id":"milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-rhd-16","title":"Milltek Active Valve Control Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Sport Diff without Brace Bars RHD 16+","description":"\u003ch2\u003eMilltek Active Valve Control for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Switchable Exhaust Volume\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's active valve control system for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only. It adds an electronically-operated valve to an existing Milltek system, opening a second, less restrictive path through the silencer that stays closed for a refined, near-standard tone around town and opens under load or at the press of a button for a louder, more open sound.\u003c\/p\u003e\n\u003cp\u003eIt's the option to go for if you want the flexibility to keep the car quiet for early starts and long motorway runs, then switch to the full exhaust note whenever you actually want to hear it, without swapping any hardware.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Active Valve Control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValvesonic:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi SQ5 3.0TFSI V6 Turbo (2017 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S4 3.0 GPF ONLY - Non Sport Diff models, or any model not listed above.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. This involves connecting to the car's wiring and exhaust valves, so we recommend fitting by a specialist familiar with the car's electrics.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-hjs-tuning-ece-downpipes-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek HJS Tuning ECE Downpipes Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eHow is it controlled?\u003c\/h3\u003e\n\u003cp\u003eDepending on the version, it is controlled using the car's own drive select modes or ESP button.\u003c\/p\u003e\n\u003ch3\u003eWill the car be louder all the time?\u003c\/h3\u003e\n\u003cp\u003eNo. With the valve closed the tone stays close to standard; open it when you want the full exhaust note.\u003c\/p\u003e\n\u003ch3\u003eIs this a complete exhaust system?\u003c\/h3\u003e\n\u003cp\u003eNo. It is designed to be used with the system or factory parts described above, rather than as a complete exhaust on its own.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392730280321,"sku":"MIL-SSXAU677","price":558.86,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU677_1_88acb4c5-61b3-483f-8387-cd4407b587b7.jpg?v=1791891336"},{"product_id":"milltek-hjs-tuning-ece-downpipes-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-rhd-16","title":"Milltek HJS Tuning ECE Downpipes Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Sport Diff without Brace Bars RHD 16+","description":"\u003ch2\u003eMilltek HJS Tuning ECE Downpipes for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Improved Flow, Sports Catalyst\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's HJS Tuning ECE downpipe set for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only. These replace the factory downpipes with HJS high-flow sports catalysts that carry full ECE type-approval, so you get a genuine flow improvement over the restrictive factory units without taking the car outside emissions compliance.\u003c\/p\u003e\n\u003cp\u003eThey're aimed at drivers who want more from the downpipes than the standard units allow, but need the car to stay legally usable on the road and pass an emissions test, which a straight de-cat pipe won't do.\u003c\/p\u003e\n\u003cp\u003eBecause they're type-approved, these can be run on a car that's used on the road, unlike a straight de-cat pipe.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e HJS Tuning ECE Downpipes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eHigh-flow sports catalyst flows better than the dense factory unit while still treating exhaust gases\u003c\/li\u003e\n\u003cli\u003eEC approved\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S4 3.0 GPF ONLY - Non Sport Diff models, or any model not listed above.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. Before ordering, note: Fits with OE and Milltek Sport Cat back Systems (EC Approved). This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Active Valve Control Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eEvery version of this part is listed by Milltek as EC approved.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eA suitable remap is strongly recommended, as the engine management needs to account for the change in flow and sensor readings. Speak to your tuner before fitting.\u003c\/p\u003e\n\u003ch3\u003eCan I use it with my standard exhaust?\u003c\/h3\u003e\n\u003cp\u003eIt depends on the version. Some are made for the factory (OE) system and others for the Milltek cat-back, so check the notes for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eHow is a sports cat different from a de-cat?\u003c\/h3\u003e\n\u003cp\u003eA sports cat still contains a catalyst, just a less dense one that flows better than the factory unit. A de-cat removes the catalyst completely.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392730313089,"sku":"MIL-SSXAU725","price":3481.92,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU725_1_e2b8ceb9-dc0e-43f0-85d6-472813eae88f.jpg?v=1791891340"},{"product_id":"milltek-sports-cat-downpipe-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-rhd-16","title":"Milltek Sports Cat Downpipe Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Sport Diff without Brace Bars RHD 16+","description":"\u003ch2\u003eMilltek Hi-Flow Sports Cat \u0026amp; Downpipe for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Improved Flow, Sports Catalyst\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's large-bore downpipe with hi-flow sports cat for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only. It replaces the restrictive factory downpipe with a larger-bore pipe fitted with a high-flow sports catalyst in place of the standard unit, using a less dense substrate that flows significantly better than the factory cat while still treating the exhaust gases passing through it.\u003c\/p\u003e\n\u003cp\u003eIt sits between a stock downpipe and a full de-cat: a genuine flow gain suited to a Stage 1 or Stage 2 remap, without giving up the catalyst entirely the way a de-cat pipe does.\u003c\/p\u003e\n\u003cp\u003eIn the UK, a replacement catalyst on a car first registered from 1 March 2001 needs ECE R103 type-approval to be road legal, so check the EC Approved line in the specification for the version you choose.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Hi-Flow Sports Cat and Downpipe\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eHigh-flow sports catalyst flows better than the dense factory unit while still treating exhaust gases\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S4 3.0 GPF ONLY - Non Sport Diff models, or any model not listed above.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. Before ordering, note: 200 Cell HJS High Flow Sport Cat, fits with OE and Milltek Sport Cat back Systems. This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Active Valve Control Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eMilltek lists this as a race part without EC approval, so it is intended for off-road and competition use.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eA suitable remap is strongly recommended, as the engine management needs to account for the change in flow and sensor readings. Speak to your tuner before fitting.\u003c\/p\u003e\n\u003ch3\u003eCan I use it with my standard exhaust?\u003c\/h3\u003e\n\u003cp\u003eIt depends on the version. Some are made for the factory (OE) system and others for the Milltek cat-back, so check the notes for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eHow is a sports cat different from a de-cat?\u003c\/h3\u003e\n\u003cp\u003eA sports cat still contains a catalyst, just a less dense one that flows better than the factory unit. A de-cat removes the catalyst completely.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392730575233,"sku":"MIL-SSXAU673","price":2330.42,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU673_1_5fcb2cd1-417d-402d-b3f9-ee2e9b1c9e00.jpg?v=1791891346"},{"product_id":"milltek-cat-replacement-pipe-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-rhd-16","title":"Milltek Cat Replacement Pipe Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Sport Diff without Brace Bars RHD 16+","description":"\u003ch2\u003eMilltek Cat Replacement Pipe for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards) – Maximum Flow, Motorsport Use\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's large-bore downpipe and de-cat for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only. It replaces the factory downpipe with a larger-bore pipe and removes the catalytic converter entirely, clearing the single most restrictive point in the exhaust for the biggest flow gain available at this position in the system. It's usually fitted alongside a Stage 2 remap, since the ECU needs to be told to expect the different readings the lambda sensors give once the cat's gone.\u003c\/p\u003e\n\u003cp\u003eIt's built for owners already committed to a serious power upgrade rather than a casual bolt-on, so pair it with the matching Milltek cat-back system for the full effect.\u003c\/p\u003e\n\u003cp\u003eBecause it removes the cat, it's intended for off-road and competition use. A de-catted car will fail an MOT emissions test and isn't legal to use on UK roads.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Cat Replacement Pipe\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1 to 1.5 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eRemoves the factory catalyst for maximum flow (off-road and competition use only)\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe Only B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Coupe\/Cabrio B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (LCI NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Non Sport Diff Models Only) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; WITH Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Left Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 V6 Turbo Sportback B9 (NON GPF ONLY - Sport Diff Models Only \u0026amp; without Brace Bars) - Right Hand Drive Cars Only (2017 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S4 3.0 GPF ONLY - Non Sport Diff models, or any model not listed above.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1 to 1.5 hours. Before ordering, note: Cat Bypass, fits with OE and Milltek Sport Cat back Systems. This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-active-valve-control-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Active Valve Control Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e, \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eNo. Removing the catalyst means the car will fail an MOT emissions test, so it is for off-road and competition use only.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eA suitable remap is strongly recommended, as the engine management needs to account for the change in flow and sensor readings. Speak to your tuner before fitting.\u003c\/p\u003e\n\u003ch3\u003eCan I use it with my standard exhaust?\u003c\/h3\u003e\n\u003cp\u003eIt depends on the version. Some are made for the factory (OE) system and others for the Milltek cat-back, so check the notes for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eWill removing the cat cause a warning light?\u003c\/h3\u003e\n\u003cp\u003eWithout suitable software it is likely to, as the ECU expects the readings a working catalyst gives. This is why Milltek pairs it with a remap.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1 to 1.5 hours.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392730640769,"sku":"MIL-SSXAU674","price":653.23,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU674_1_7da3da80-62df-47fd-91b7-bfbf1cd47e50.jpg?v=1791891350"},{"product_id":"milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-rhd-16","title":"Milltek Cat Back Exhaust Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Sport Diff without Brace Bars RHD 16+","description":"\u003ch2\u003eMilltek Cat-back Exhaust for Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards) – Sharper Sound, Reduced Back Pressure\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's cat-back system for the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only. It replaces everything from the factory catalytic converter rearward with wider-bore pipework, a re-profiled mid-pipe and silencers tuned specifically for this platform, cutting back pressure and sharpening the exhaust note. The factory catalytic converter stays in place, so the car's emissions hardware is left as standard. It's offered in non-resonated, resonated or resonated EC approved versions and 7 tailpipe finishes, so you can pick the setup that suits how the car's used.\u003c\/p\u003e\n\u003cp\u003eIt's aimed at owners who want a noticeably different sound and a genuine, if modest, flow improvement without touching anything upstream of the cat: a straightforward bolt-on that doesn't need a remap or any other supporting mods to enjoy.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Cat-back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eReplaces the standard exhaust from the catalytic converter back, so the factory cat is retained\u003c\/li\u003e\n\u003cli\u003eChoice of 7 tailpipe finishes: Cerakote Black Oval, GT-100 Burnt Titanium, GT-100 Cerakote Black, GT-100 Polished, GT-100 Titanium, JET-100 Carbon Fibre, Polished Oval\u003c\/li\u003e\n\u003cli\u003eEC approved versions available\u003c\/li\u003e\n\u003cli\u003eResonated (quieter) or non-resonated (louder) versions\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003eAudi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Right Hand Drive Cars Only (2016 onwards)\u003c\/li\u003e\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Sport Diff \u0026amp; Without Brace Bars) - Left Hand Drive Cars 16+\u003c\/a\u003e; the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-rhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Right Hand Drive Cars 16+\u003c\/a\u003e; the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-non-sport-diff-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eWe recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.\u003c\/p\u003e\n\u003ch3\u003eWhat's the difference between the resonated and non-resonated versions?\u003c\/h3\u003e\n\u003cp\u003eThe resonated version adds extra silencing for a quieter, more refined tone. The non-resonated version leaves it out, so it is louder and more aggressive.\u003c\/p\u003e\n\u003ch3\u003eWhich tailpipe finishes are available?\u003c\/h3\u003e\n\u003cp\u003eYou can choose from: Cerakote Black Oval, GT-100 Burnt Titanium, GT-100 Cerakote Black, GT-100 Polished, GT-100 Titanium, JET-100 Carbon Fibre, Polished Oval. The finish is cosmetic and does not change the sound.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the Audi S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (NON GPF ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-3-0-turbo-v6-b9-saloon-avant-non-gpf-sport-diff-without-brace-bars-lhd-16\"\u003eMilltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon \u0026amp; Avant (NON GPF - Sport Diff \u0026amp; Without Brace Bars) - Left Hand Drive Cars 16+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eSome versions are EC approved; check the EC Approved line in the specification for the option you choose.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eNo. It fits behind the factory catalytic converter, so no software changes are needed.\u003c\/p\u003e\n\u003ch3\u003eDoes it keep the factory catalytic converter?\u003c\/h3\u003e\n\u003cp\u003eYes. It fits behind the factory catalytic converter, which stays in place.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Non-Resonated \/ Cerakote Black Oval","offer_id":56392730673537,"sku":"MIL-SSXAU1102","price":2751.46,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Burnt Titanium","offer_id":56392730706305,"sku":"MIL-SSXAU1100","price":3037.97,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Cerakote Black","offer_id":56392730739073,"sku":"MIL-SSXAU1098","price":2415.4,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Polished","offer_id":56392730771841,"sku":"MIL-SSXAU1097","price":2415.46,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Titanium","offer_id":56392730804609,"sku":"MIL-SSXAU1099","price":2721.7,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ JET-100 Carbon Fibre","offer_id":56392730837377,"sku":"MIL-SSXAU1104","price":2669.78,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ Polished Oval","offer_id":56392730870145,"sku":"MIL-SSXAU1101","price":2579.6,"currency_code":"GBP","in_stock":true},{"title":"Resonated \/ JET-100 Carbon Fibre","offer_id":56392730902913,"sku":"MIL-SSXAU1103","price":2839.23,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ Cerakote Black Oval","offer_id":56392730935681,"sku":"MIL-SSXAU1096","price":2920.91,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Burnt Titanium","offer_id":56392730968449,"sku":"MIL-SSXAU1094","price":3207.42,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Cerakote Black","offer_id":56392731001217,"sku":"MIL-SSXAU1105","price":2584.85,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Polished","offer_id":56392731033985,"sku":"MIL-SSXAU1091","price":2584.91,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Titanium","offer_id":56392731066753,"sku":"MIL-SSXAU1093","price":2703.8,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ Polished Oval","offer_id":56392731099521,"sku":"MIL-SSXAU1095","price":2749.05,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU1102_1.jpg?v=1791891379"},{"product_id":"milltek-cat-replacement-pipes-audi-s4-4-2-v8-quattro-b6-saloon-avant-cabriolet-03-05","title":"Milltek Cat Replacement Pipes Audi S4 4.2 V8 Quattro B6 Saloon Avant Cabriolet 03-05","description":"\u003ch2\u003eMilltek Cat Replacement Pipes for Audi S4 4.2 V8 quattro B6 Saloon\/Sedan, Avant \u0026amp; Cabriolet (2003-2005) – Maximum Flow, Motorsport Use\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's large-bore downpipe and de-cat for the Audi S4 4.2 V8 quattro B6 Saloon\/Sedan, Avant \u0026amp; Cabriolet. It replaces the factory downpipe with a larger-bore pipe and removes the catalytic converter entirely, clearing the single most restrictive point in the exhaust for the biggest flow gain available at this position in the system. It's usually fitted alongside a Stage 2 remap, since the ECU needs to be told to expect the different readings the lambda sensors give once the cat's gone.\u003c\/p\u003e\n\u003cp\u003eIt's built for owners already committed to a serious power upgrade rather than a casual bolt-on, so pair it with the matching Milltek cat-back system for the full effect.\u003c\/p\u003e\n\u003cp\u003eBecause it removes the cat, it's intended for off-road and competition use. A de-catted car will fail an MOT emissions test and isn't legal to use on UK roads.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Cat Replacement Pipes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eRemoves the factory catalyst for maximum flow (off-road and competition use only)\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 4.2 V8 quattro B6 Saloon\/Sedan, Avant \u0026amp; Cabriolet (2003-2005)\u003c\/li\u003e\n\u003cli\u003eAudi S4 4.2 V8 quattro B7 Saloon\/Sedan, Avant \u0026amp; Cabriolet (2004-2009)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e any model, engine or body style not listed above. Check your car before ordering.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eBefore ordering, note: Manual Only. Must be fitted with the Milltek Sport cat-back system and requires a Stage 2 ECU remap. This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-4-2-v8-quattro-b6-saloon-avant-cabriolet-03-05\"\u003eMilltek Cat-back Exhaust Audi S4 4.2 V8 Quattro B6 Saloon, Avant, Cabriolet 03-05\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 4.2 V8 quattro B7 Saloon\/Sedan, Avant \u0026amp; Cabriolet?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 4.2 V8 quattro B7 Saloon\/Sedan, Avant \u0026amp; Cabriolet as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eNo. Removing the catalyst means the car will fail an MOT emissions test, so it is for off-road and competition use only.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek notes: \"Manual Only. Must be fitted with the Milltek Sport cat-back system and requires a Stage 2 ECU remap\". Without suitable software the engine management is likely to log faults.\u003c\/p\u003e\n\u003ch3\u003eCan I use it with my standard exhaust?\u003c\/h3\u003e\n\u003cp\u003eNo. Milltek states it must be fitted with the matching Milltek system, so budget for the cat-back as well.\u003c\/p\u003e\n\u003ch3\u003eWill removing the cat cause a warning light?\u003c\/h3\u003e\n\u003cp\u003eWithout suitable software it is likely to, as the ECU expects the readings a working catalyst gives. This is why Milltek pairs it with a remap.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392731165057,"sku":"MIL-SSXAU289","price":530.73,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU289_1.jpg?v=1791891361"},{"product_id":"milltek-cat-back-exhaust-audi-s4-4-2-v8-quattro-b6-saloon-avant-cabriolet-03-05","title":"Milltek Cat Back Exhaust Audi S4 4.2 V8 Quattro B6 Saloon Avant Cabriolet 03-05","description":"\u003ch2\u003eMilltek Cat-back Exhaust for Audi S4 4.2 V8 quattro B6 Saloon\/Sedan, Avant \u0026amp; Cabriolet (2003-2005) – Sharper Sound, Reduced Back Pressure\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's cat-back system for the Audi S4 4.2 V8 quattro B6 Saloon\/Sedan, Avant \u0026amp; Cabriolet. It replaces everything from the factory catalytic converter rearward with wider-bore pipework, a re-profiled mid-pipe and silencers tuned specifically for this platform, cutting back pressure and sharpening the exhaust note. The factory catalytic converter stays in place, so the car's emissions hardware is left as standard. It's offered in non-resonated or resonated versions and 4 tailpipe finishes, so you can pick the setup that suits how the car's used.\u003c\/p\u003e\n\u003cp\u003eIt's aimed at owners who want a noticeably different sound and a genuine, if modest, flow improvement without touching anything upstream of the cat: a straightforward bolt-on that doesn't need a remap or any other supporting mods to enjoy.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Cat-back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 57.15mm (2.25\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e57.15mm (2.25\") pipework\u003c\/li\u003e\n\u003cli\u003eReplaces the standard exhaust from the catalytic converter back, so the factory cat is retained\u003c\/li\u003e\n\u003cli\u003eChoice of 4 tailpipe finishes: GT-100 Polished, JET-100 Polished, GT-100 Cerakote Black, JET-100 Cerakote Black\u003c\/li\u003e\n\u003cli\u003eResonated (quieter) or non-resonated (louder) versions\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 4.2 V8 quattro B6 Saloon\/Sedan, Avant \u0026amp; Cabriolet (2003-2005)\u003c\/li\u003e\n\u003cli\u003eAudi A4 3.0 V6 B6 quattro Saloon Avant \u0026amp; Cabriolet (2001-2005)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot every version fits every car in this list. Check the fitment shown for the option you select.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the Audi S4 4.2 V8 quattro B7 Saloon\/Sedan, Avant \u0026amp; Cabriolet, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-4-2-v8-quattro-b7-saloon-avant-cabriolet-04-09\"\u003eMilltek Cat-back Exhaust Audi S4 4.2 V8 Quattro B7 Saloon, Avant, Cabriolet 04-09\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eThe fitting time varies by version; see the specification table for the option you choose. We recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-cat-replacement-pipes-audi-s4-4-2-v8-quattro-b6-saloon-avant-cabriolet-03-05\"\u003eMilltek Cat Replacement Pipes Audi S4 4.2 V8 Quattro B6 Saloon, Avant, Cabriolet 03-05\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWhat's the difference between the resonated and non-resonated versions?\u003c\/h3\u003e\n\u003cp\u003eThe resonated version adds extra silencing for a quieter, more refined tone. The non-resonated version leaves it out, so it is louder and more aggressive.\u003c\/p\u003e\n\u003ch3\u003eWhich tailpipe finishes are available?\u003c\/h3\u003e\n\u003cp\u003eYou can choose from: GT-100 Polished, JET-100 Polished, GT-100 Cerakote Black, JET-100 Cerakote Black. The finish is cosmetic and does not change the sound.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi A4 3.0 V6 B6 quattro Saloon Avant \u0026amp; Cabriolet?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi A4 3.0 V6 B6 quattro Saloon Avant \u0026amp; Cabriolet as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the Audi S4 4.2 V8 quattro B7 Saloon\/Sedan, Avant \u0026amp; Cabriolet?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-4-2-v8-quattro-b7-saloon-avant-cabriolet-04-09\"\u003eMilltek Cat-back Exhaust Audi S4 4.2 V8 Quattro B7 Saloon, Avant, Cabriolet 04-09\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eMilltek does not list EC approval for this part. Any exhaust used on the road must still meet noise and emissions rules, so check the requirements where you live.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eNo. It fits behind the factory catalytic converter, so no software changes are needed.\u003c\/p\u003e\n\u003ch3\u003eDoes it keep the factory catalytic converter?\u003c\/h3\u003e\n\u003cp\u003eYes. It fits behind the factory catalytic converter, which stays in place.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eIt depends on the version. Milltek's fitting time for each option is shown in its specification table.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Non-Resonated \/ GT-100 Polished","offer_id":56392731197825,"sku":"MIL-SSXAU038","price":1024.67,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ JET-100 Polished","offer_id":56392731230593,"sku":"MIL-SSXAU295","price":1024.22,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Cerakote Black","offer_id":56392731263361,"sku":"MIL-SSXAU873","price":1114.73,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ JET-100 Cerakote Black","offer_id":56392731296129,"sku":"MIL-SSXAU872","price":1112.24,"currency_code":"GBP","in_stock":true},{"title":"Resonated \/ GT-100 Polished","offer_id":56392731328897,"sku":"MIL-SSXAU296","price":1161.55,"currency_code":"GBP","in_stock":true},{"title":"Resonated \/ JET-100 Polished","offer_id":56392731361665,"sku":"MIL-SSXAU100","price":1162.01,"currency_code":"GBP","in_stock":true},{"title":"Resonated \/ GT-100 Cerakote Black","offer_id":56392731394433,"sku":"MIL-SSXAU875","price":1252.06,"currency_code":"GBP","in_stock":true},{"title":"Resonated \/ JET-100 Cerakote Black","offer_id":56392731427201,"sku":"MIL-SSXAU874","price":1249.57,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU038_2.jpg?v=1791891376"},{"product_id":"milltek-cat-replacement-pipes-audi-s4-4-2-v8-quattro-b7-saloon-avant-cabriolet-04-09","title":"Milltek Cat Replacement Pipes Audi S4 4.2 V8 Quattro B7 Saloon Avant Cabriolet 04-09","description":"\u003ch2\u003eMilltek Cat Replacement Pipes for Audi S4 4.2 V8 quattro B6 Saloon\/Sedan, Avant \u0026amp; Cabriolet (2003-2005) – Maximum Flow, Motorsport Use\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's large-bore downpipe and de-cat for the Audi S4 4.2 V8 quattro B7 Saloon\/Sedan, Avant \u0026amp; Cabriolet. It replaces the factory downpipe with a larger-bore pipe and removes the catalytic converter entirely, clearing the single most restrictive point in the exhaust for the biggest flow gain available at this position in the system. It's usually fitted alongside a Stage 2 remap, since the ECU needs to be told to expect the different readings the lambda sensors give once the cat's gone.\u003c\/p\u003e\n\u003cp\u003eIt's built for owners already committed to a serious power upgrade rather than a casual bolt-on, so pair it with the matching Milltek cat-back system for the full effect.\u003c\/p\u003e\n\u003cp\u003eBecause it removes the cat, it's intended for off-road and competition use. A de-catted car will fail an MOT emissions test and isn't legal to use on UK roads.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Cat Replacement Pipes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 63.5mm (2.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e63.5mm (2.5\") pipework\u003c\/li\u003e\n\u003cli\u003eRemoves the factory catalyst for maximum flow (off-road and competition use only)\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 4.2 V8 quattro B6 Saloon\/Sedan, Avant \u0026amp; Cabriolet (2003-2005)\u003c\/li\u003e\n\u003cli\u003eAudi S4 4.2 V8 quattro B7 Saloon\/Sedan, Avant \u0026amp; Cabriolet (2004-2009)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e any model, engine or body style not listed above. Check your car before ordering.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eBefore ordering, note: Manual Only. Must be fitted with the Milltek Sport cat-back system and requires a Stage 2 ECU remap. This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-4-2-v8-quattro-b6-saloon-avant-cabriolet-03-05\"\u003eMilltek Cat-back Exhaust Audi S4 4.2 V8 Quattro B6 Saloon, Avant, Cabriolet 03-05\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S4 4.2 V8 quattro B7 Saloon\/Sedan, Avant \u0026amp; Cabriolet?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S4 4.2 V8 quattro B7 Saloon\/Sedan, Avant \u0026amp; Cabriolet as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eNo. Removing the catalyst means the car will fail an MOT emissions test, so it is for off-road and competition use only.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek notes: \"Manual Only. Must be fitted with the Milltek Sport cat-back system and requires a Stage 2 ECU remap\". Without suitable software the engine management is likely to log faults.\u003c\/p\u003e\n\u003ch3\u003eCan I use it with my standard exhaust?\u003c\/h3\u003e\n\u003cp\u003eNo. Milltek states it must be fitted with the matching Milltek system, so budget for the cat-back as well.\u003c\/p\u003e\n\u003ch3\u003eWill removing the cat cause a warning light?\u003c\/h3\u003e\n\u003cp\u003eWithout suitable software it is likely to, as the ECU expects the readings a working catalyst gives. This is why Milltek pairs it with a remap.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":56392731492737,"sku":"MIL-SSXAU289","price":530.73,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU289_1_02e1c7e0-c14e-4b79-993a-1978345082e0.jpg?v=1791891367"},{"product_id":"milltek-cat-back-exhaust-audi-s4-4-2-v8-quattro-b7-saloon-avant-cabriolet-04-09","title":"Milltek Cat Back Exhaust Audi S4 4.2 V8 Quattro B7 Saloon Avant Cabriolet 04-09","description":"\u003ch2\u003eMilltek Cat-back Exhaust for Audi S4 4.2 V8 quattro B7 Saloon\/Sedan, Avant \u0026amp; Cabriolet (2004-2009) – Sharper Sound, Reduced Back Pressure\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's cat-back system for the Audi S4 4.2 V8 quattro B7 Saloon\/Sedan, Avant \u0026amp; Cabriolet. It replaces everything from the factory catalytic converter rearward with wider-bore pipework, a re-profiled mid-pipe and silencers tuned specifically for this platform, cutting back pressure and sharpening the exhaust note. The factory catalytic converter stays in place, so the car's emissions hardware is left as standard. It's offered in non-resonated or resonated versions, so you can pick the setup that suits how the car's used.\u003c\/p\u003e\n\u003cp\u003eIt's aimed at owners who want a noticeably different sound and a genuine, if modest, flow improvement without touching anything upstream of the cat: a straightforward bolt-on that doesn't need a remap or any other supporting mods to enjoy.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Cat-back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 57.15mm (2.25\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Style:\u003c\/strong\u003e Twin 76.2mm Special\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 1.5 to 2 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e57.15mm (2.25\") pipework\u003c\/li\u003e\n\u003cli\u003eReplaces the standard exhaust from the catalytic converter back, so the factory cat is retained\u003c\/li\u003e\n\u003cli\u003eResonated (quieter) or non-resonated (louder) versions\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003eAudi S4 4.2 V8 quattro B7 Saloon\/Sedan, Avant \u0026amp; Cabriolet (2004-2009)\u003c\/li\u003e\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the Audi S4 4.2 V8 quattro B6 Saloon\/Sedan, Avant \u0026amp; Cabriolet, which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-4-2-v8-quattro-b6-saloon-avant-cabriolet-03-05\"\u003eMilltek Cat-back Exhaust Audi S4 4.2 V8 Quattro B6 Saloon, Avant, Cabriolet 03-05\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 1.5 to 2 hours. We recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.\u003c\/p\u003e\n\u003ch3\u003eWhat's the difference between the resonated and non-resonated versions?\u003c\/h3\u003e\n\u003cp\u003eThe resonated version adds extra silencing for a quieter, more refined tone. The non-resonated version leaves it out, so it is louder and more aggressive.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the Audi S4 4.2 V8 quattro B6 Saloon\/Sedan, Avant \u0026amp; Cabriolet?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-cat-back-exhaust-audi-s4-4-2-v8-quattro-b6-saloon-avant-cabriolet-03-05\"\u003eMilltek Cat-back Exhaust Audi S4 4.2 V8 Quattro B6 Saloon, Avant, Cabriolet 03-05\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eMilltek does not list EC approval for this part. Any exhaust used on the road must still meet noise and emissions rules, so check the requirements where you live.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eNo. It fits behind the factory catalytic converter, so no software changes are needed.\u003c\/p\u003e\n\u003ch3\u003eDoes it keep the factory catalytic converter?\u003c\/h3\u003e\n\u003cp\u003eYes. It fits behind the factory catalytic converter, which stays in place.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 1.5 to 2 hours.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Non-Resonated","offer_id":56392731689345,"sku":"MIL-SSXAU048","price":1086.93,"currency_code":"GBP","in_stock":true},{"title":"Resonated","offer_id":56392731722113,"sku":"MIL-SSXAU046","price":1224.27,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU048_1.jpg?v=1791891373"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/collections\/audi-s4.jpg?v=1791897469","url":"https:\/\/milltekexhaustshop.com\/collections\/audi-s4-performance-exhaust-systems.oembed","provider":"Milltek Exhaust Shop","version":"1.0","type":"link"}