{"title":"Milltek Audi S8 Performance Exhaust Systems","description":"\u003cp\u003eMilltek parts for the Audi S8 span the D4 4.0 TFSI quattro Tiptronic from 2013 to 2018 and the D5 4.0 TFSI V8 Saloon from 2020. D4 owners can choose a cat-back, hi-flow sports cats or cat replacement pipes. D5 parts are split into UK and European OPF\/GPF cars and non-OPF US and rest-of-world cars, with standard and long-wheelbase versions. See the full \u003ca href=\"\/collections\/audi-performance-exhaust-systems\"\u003eMilltek Audi range\u003c\/a\u003e too.\u003c\/p\u003e","products":[{"product_id":"milltek-cat-replacement-pipes-audi-s8-d4-4-0-tfsi-quattro-tiptronic-13-18","title":"Milltek Cat Replacement Pipes Audi S8 D4 4.0 TFSI Quattro Tiptronic 13-18","description":"\u003ch2\u003eMilltek Cat Replacement Pipes for Audi S8 D4 4.0 TFSI quattro Tiptronic (2013-2018) – Maximum Flow, Motorsport Use\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's large-bore downpipe and de-cat for the Audi S8 D4 4.0 TFSI quattro Tiptronic. 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 70mm (2.76\")\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\u003e70mm (2.76\") 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\u003cli\u003eAudi S8 D4 4.0 TFSI quattro Tiptronic (2013-2018)\u003c\/li\u003e\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: Requires a Stage 2 ECU remap Fit only with Milltek Sport Cat Back (lambda cables need extending). 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-s8-d4-4-0-tfsi-quattro-tiptronic-13-18\"\u003eMilltek Cat-back Exhaust Audi S8 D4 4.0 TFSI Quattro Tiptronic 13-18\u003c\/a\u003e.\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: \"Requires a Stage 2 ECU remap Fit only with Milltek Sport Cat Back (lambda cables need extending)\". 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":56392747581825,"sku":"MIL-SSXAU954","price":1723.73,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU954_1.jpg?v=1791891643"},{"product_id":"milltek-hi-flow-sports-cats-audi-s8-d4-4-0-tfsi-quattro-tiptronic-13-18","title":"Milltek Hi-Flow Sports Cats Audi S8 D4 4.0 TFSI Quattro Tiptronic 13-18","description":"\u003ch2\u003eMilltek Hi-Flow Sports Cats for Audi S8 D4 4.0 TFSI quattro Tiptronic (2013-2018) – Improved Flow, Sports Catalyst\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's large-bore downpipe with hi-flow sports cat for the Audi S8 D4 4.0 TFSI quattro Tiptronic. 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 Cats\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 70mm (2.76\")\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\u003e70mm (2.76\") 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\u003cli\u003eAudi S8 D4 4.0 TFSI quattro Tiptronic (2013-2018)\u003c\/li\u003e\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: Requires a Stage 2 ECU remap Fits only with Milltek Sport Cat Back (lambda cables need extending). 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-s8-d4-4-0-tfsi-quattro-tiptronic-13-18\"\u003eMilltek Cat-back Exhaust Audi S8 D4 4.0 TFSI Quattro Tiptronic 13-18\u003c\/a\u003e.\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\u003eYes. Milltek notes: \"Requires a Stage 2 ECU remap Fits only with Milltek Sport Cat Back (lambda cables need extending)\". 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\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\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":56392747614593,"sku":"MIL-SSXAU953","price":4250.18,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU953_1.jpg?v=1791891645"},{"product_id":"milltek-cat-back-exhaust-audi-s8-d4-4-0-tfsi-quattro-tiptronic-13-18","title":"Milltek Cat Back Exhaust Audi S8 D4 4.0 TFSI Quattro Tiptronic 13-18","description":"\u003ch2\u003eMilltek Cat-back Exhaust for Audi S8 D4 4.0 TFSI quattro Tiptronic (2013-2018) – Sharper Sound, Reduced Back Pressure\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's cat-back system for the Audi S8 D4 4.0 TFSI quattro Tiptronic. 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 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 70mm (2.76\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Style:\u003c\/strong\u003e Quad 100mm GT100\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\u003e70mm (2.76\") 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: GT-100 Cerakote Black, GT-100 Polished, GT-100 Titanium\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 S8 D4 4.0 TFSI quattro Tiptronic (2013-2018)\u003c\/li\u003e\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\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\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-cat-replacement-pipes-audi-s8-d4-4-0-tfsi-quattro-tiptronic-13-18\"\u003eMilltek Cat Replacement Pipes Audi S8 D4 4.0 TFSI Quattro Tiptronic 13-18\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 Cerakote Black, GT-100 Polished, GT-100 Titanium. The finish is cosmetic and does not change the sound.\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 \/ GT-100 Cerakote Black","offer_id":56392747647361,"sku":"MIL-SSXAU469","price":3292.56,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Polished","offer_id":56392747680129,"sku":"MIL-SSXAU468","price":3292.61,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-100 Titanium","offer_id":56392747712897,"sku":"MIL-SSXAU467","price":3598.87,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Cerakote Black","offer_id":56392747745665,"sku":"MIL-SSXAU464","price":3543.3,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Polished","offer_id":56392747778433,"sku":"MIL-SSXAU465","price":3543.35,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-100 Titanium","offer_id":56392747811201,"sku":"MIL-SSXAU466","price":3849.6,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU469_1.jpg?v=1791891655"},{"product_id":"milltek-downpipes-with-cat-bypass-audi-s8-d5-4-0-tfsi-v8-saloon-lwb-non-opf-gpf-us-row-20","title":"Milltek Downpipes with Cat Bypass Audi S8 D5 4.0 TFSI V8 Saloon LWB Non-OPF\/GPF US ROW 20+","description":"\u003ch2\u003eMilltek Downpipes \u0026amp; Cat Bypass Pipes for Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (Non OPF\/GPF Models - USA\/ROW Models) (2020 onwards) – Maximum Flow, Motorsport Use\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's large-bore downpipe and de-cat for the Audi S8 D5 4.0 TFSI V8 Saloon\/Sedan - Long Wheel Base (Non OPF\/GPF US\/ROW Models). 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. It's offered in versions to suit the factory or a Milltek system, so you can pick the setup that suits how the car's used.\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 Large-bore Downpipes and Cat Bypass Pipes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 80mm (3.15\")\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. 3.5 to 4.5 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\u003e80mm (3.15\") 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 RS6 C8 4.0 V8 bi-turbo in Performance Edition (Non OPF\/GPF Models - USA\/ROW Models) (2020 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi RS7 C8 4.0 V8 bi-turbo (Non OPF\/GPF US\/ROW Models) (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S8 D5 4.0 TFSI V8 Saloon\/Sedan - Long Wheel Base (Non OPF\/GPF US\/ROW Models) (2020 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S8 D5 4.0 TFSI V8 Saloon\/Sedan - Standard Wheel Base (Non OPF\/GPF US\/ROW Models) (2020 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (OPF\/GPF Models), which needs the \u003ca href=\"\/products\/milltek-downpipes-with-cat-bypass-audi-rs6-c8-4-0-v8-bi-turbo-opf-gpf-19\"\u003eMilltek Downpipes \u0026amp; Cat Bypass Pipes Audi RS6 C8 4.0 V8 bi-turbo OPF\/GPF 19+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 3.5 to 4.5 hours. Some versions: Fits to Milltek Sport Cat Back System - Requires Stage 2 ECU Software. Some versions: Fits to OE Catback Back System - Requires Stage 2 ECU Software. 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-front-pipe-back-exhaust-audi-rs6-c8-4-0-v8-bi-turbo-opf-gpf-19\"\u003eMilltek Front Pipe-back Exhaust Audi RS6 C8 4.0 V8 Bi-Turbo OPF\/GPF 19+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi RS7 C8 4.0 V8 bi-turbo (Non OPF\/GPF US\/ROW Models)?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi RS7 C8 4.0 V8 bi-turbo (Non OPF\/GPF US\/ROW Models) as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (OPF\/GPF Models)?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-downpipes-with-cat-bypass-audi-rs6-c8-4-0-v8-bi-turbo-opf-gpf-19\"\u003eMilltek Downpipes \u0026amp; Cat Bypass Pipes Audi RS6 C8 4.0 V8 bi-turbo OPF\/GPF 19+\u003c\/a\u003e.\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: \"Fits to Milltek Sport Cat Back System - Requires Stage 2 ECU Software\". 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\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. 3.5 to 4.5 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":"Fits Milltek Cat Back Only","offer_id":56392747876737,"sku":"MIL-SSXAU907","price":2714.1,"currency_code":"GBP","in_stock":true},{"title":"Fits OE System Only","offer_id":56392747909505,"sku":"MIL-SSXAU908","price":2700.42,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU907_1.jpg?v=1791891654"},{"product_id":"milltek-sports-cat-downpipes-audi-s8-d5-4-0-tfsi-v8-saloon-lwb-non-opf-gpf-us-row-20","title":"Milltek Sports Cat Downpipes Audi S8 D5 4.0 TFSI V8 Saloon LWB Non-OPF\/GPF US ROW 20+","description":"\u003ch2\u003eMilltek Downpipes \u0026amp; Sports Cats for Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (Non OPF\/GPF Models - USA\/ROW Models) (2020 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 S8 D5 4.0 TFSI V8 Saloon\/Sedan - Long Wheel Base (Non OPF\/GPF US\/ROW Models). 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. It's offered in versions to suit the factory or a Milltek system, so you can pick the setup that suits how the car's used.\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 Large Bore Downpipes and Hi-Flow Sports Cats\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 80mm (3.15\")\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. 3.5 to 4.5 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\u003e80mm (3.15\") 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 RS6 C8 4.0 V8 bi-turbo in Performance Edition (Non OPF\/GPF Models - USA\/ROW Models) (2020 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi RS7 C8 4.0 V8 bi-turbo (Non OPF\/GPF US\/ROW Models) (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S8 D5 4.0 TFSI V8 Saloon\/Sedan - Long Wheel Base (Non OPF\/GPF US\/ROW Models) (2020 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S8 D5 4.0 TFSI V8 Saloon\/Sedan - Standard Wheel Base (Non OPF\/GPF US\/ROW Models) (2020 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (OPF\/GPF Models), which needs the \u003ca href=\"\/products\/milltek-sports-cat-downpipes-audi-rs6-c8-4-0-v8-bi-turbo-opf-gpf-19\"\u003eMilltek Downpipes \u0026amp; Sports Cats Audi RS6 C8 4.0 V8 bi-turbo OPF\/GPF 19+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 3.5 to 4.5 hours. Some versions: Fits to Milltek Sport Catback Back System - Requires Stage 2 ECU Software. Some versions: Fits to OE Cat Back System - Requires Stage 2 ECU Software. 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-front-pipe-back-exhaust-audi-rs6-c8-4-0-v8-bi-turbo-opf-gpf-19\"\u003eMilltek Front Pipe-back Exhaust Audi RS6 C8 4.0 V8 Bi-Turbo OPF\/GPF 19+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi RS7 C8 4.0 V8 bi-turbo (Non OPF\/GPF US\/ROW Models)?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi RS7 C8 4.0 V8 bi-turbo (Non OPF\/GPF US\/ROW Models) as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (OPF\/GPF Models)?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-sports-cat-downpipes-audi-rs6-c8-4-0-v8-bi-turbo-opf-gpf-19\"\u003eMilltek Downpipes \u0026amp; Sports Cats Audi RS6 C8 4.0 V8 bi-turbo OPF\/GPF 19+\u003c\/a\u003e.\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\u003eYes. Milltek notes: \"Fits to Milltek Sport Catback Back System - Requires Stage 2 ECU Software\". 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\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. 3.5 to 4.5 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":"Fits Milltek Cat Back Only","offer_id":56392747942273,"sku":"MIL-SSXAU909","price":4477.99,"currency_code":"GBP","in_stock":true},{"title":"Fits OE System Only","offer_id":56392747975041,"sku":"MIL-SSXAU910","price":4464.3,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU909_1_4ffd34f7-0da4-49dd-b404-03e7a91be8c9.jpg?v=1791891657"},{"product_id":"milltek-cat-back-exhaust-audi-s8-d5-4-0-tfsi-v8-saloon-lwb-non-opf-gpf-us-row-20","title":"Milltek Cat Back Exhaust Audi S8 D5 4.0 TFSI V8 Saloon LWB Non-OPF\/GPF US ROW 20+","description":"\u003ch2\u003eMilltek Cat-back Exhaust for Audi S8 D5 4.0 TFSI V8 Saloon\/Sedan - Long Wheel Base (Non OPF\/GPF US\/ROW Models) (2020 onwards) – Sharper Sound, Reduced Back Pressure\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's cat-back system for the Audi S8 D5 4.0 TFSI V8 Saloon\/Sedan - Long Wheel Base (Non OPF\/GPF US\/ROW Models). 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 5 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 80mm (3.15\")\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\u003e80mm (3.15\") 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 5 tailpipe finishes: GT-115 Brushed Titanium, GT-115 Burnt Titanium, GT-115 Cerakote Black, GT-115 Polished, JET-115 Carbon Fibre\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 S8 D5 4.0 TFSI V8 Saloon\/Sedan - Long Wheel Base (Non OPF\/GPF US\/ROW Models) (2020 onwards)\u003c\/li\u003e\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the Audi S8 D5 4.0 TFSI V8 Saloon\/Sedan - Standard Wheel Base (Non OPF\/GPF US\/ROW Models), which needs the \u003ca href=\"\/products\/milltek-filter-back-exhaust-audi-s8-d5-4-0-tfsi-v8-saloon-opf-gpf-uk-euro-20\"\u003eMilltek Filter-back Exhaust Audi S8 D5 4.0 TFSI V8 Saloon OPF\/GPF UK Euro 20+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eSome versions: Non-Resonated Cat Back Back System (Twin 80mm) with GT-115 Brushed Titanium Trims (Does Not Require Cutting of the OE System) - Louder. Some versions: Non-Resonated Cat Back Back System (Twin 80mm) with GT-115 Burnt\/Blue Titanium Trims (Does Not Require Cutting of the OE System) - Louder. Some versions: Non-Resonated Cat Back Back System (Twin 80mm) with GT-115 Cerakote Black Trims (Does Not Require Cutting of the OE System) - Louder. Some versions: Non-Resonated Cat Back Back System (Twin 80mm) with GT-115 Polished Trims (Does Not Require Cutting of the OE System) - Louder. 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: GT-115 Brushed Titanium, GT-115 Burnt Titanium, GT-115 Cerakote Black, GT-115 Polished, JET-115 Carbon Fibre. The finish is cosmetic and does not change the sound.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the Audi S8 D5 4.0 TFSI V8 Saloon\/Sedan - Standard Wheel Base (Non OPF\/GPF US\/ROW Models)?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-filter-back-exhaust-audi-s8-d5-4-0-tfsi-v8-saloon-opf-gpf-uk-euro-20\"\u003eMilltek Filter-back Exhaust Audi S8 D5 4.0 TFSI V8 Saloon OPF\/GPF UK Euro 20+\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\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 \/ GT-115 Brushed Titanium","offer_id":56392748269953,"sku":"MIL-SSXAU1067","price":5081.94,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-115 Burnt Titanium","offer_id":56392748302721,"sku":"MIL-SSXAU1068","price":5208.24,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-115 Cerakote Black","offer_id":56392748335489,"sku":"MIL-SSXAU1066","price":4842.46,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-115 Polished","offer_id":56392748368257,"sku":"MIL-SSXAU1065","price":4552.97,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ JET-115 Carbon Fibre","offer_id":56392748401025,"sku":"MIL-SSXAU1069","price":5140.76,"currency_code":"GBP","in_stock":true},{"title":"Resonated \/ GT-115 Brushed Titanium","offer_id":56392748433793,"sku":"MIL-SSXAU1062","price":5250.04,"currency_code":"GBP","in_stock":true},{"title":"Resonated \/ GT-115 Burnt Titanium","offer_id":56392748466561,"sku":"MIL-SSXAU1063","price":5376.34,"currency_code":"GBP","in_stock":true},{"title":"Resonated \/ GT-115 Cerakote Black","offer_id":56392748499329,"sku":"MIL-SSXAU1061","price":5010.56,"currency_code":"GBP","in_stock":true},{"title":"Resonated \/ GT-115 Polished","offer_id":56392748532097,"sku":"MIL-SSXAU1060","price":4721.08,"currency_code":"GBP","in_stock":true},{"title":"Resonated \/ JET-115 Carbon Fibre","offer_id":56392748564865,"sku":"MIL-SSXAU1064","price":5308.87,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU1067_1.jpg?v=1791891681"},{"product_id":"milltek-downpipes-with-cat-bypass-audi-s8-d5-4-0-tfsi-v8-saloon-standard-wheel-base-non-opf-gpf-us-row-20","title":"Milltek Downpipes with Cat Bypass Audi S8 D5 4.0 TFSI V8 Saloon Standard Wheel Base Non-OPF\/GPF US ROW 20+","description":"\u003ch2\u003eMilltek Downpipes \u0026amp; Cat Bypass Pipes for Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (Non OPF\/GPF Models - USA\/ROW Models) (2020 onwards) – Maximum Flow, Motorsport Use\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's large-bore downpipe and de-cat for the Audi S8 D5 4.0 TFSI V8 Saloon\/Sedan - Standard Wheel Base (Non OPF\/GPF US\/ROW Models). 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. It's offered in versions to suit the factory or a Milltek system, so you can pick the setup that suits how the car's used.\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 Large-bore Downpipes and Cat Bypass Pipes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 80mm (3.15\")\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. 3.5 to 4.5 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\u003e80mm (3.15\") 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 RS6 C8 4.0 V8 bi-turbo in Performance Edition (Non OPF\/GPF Models - USA\/ROW Models) (2020 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi RS7 C8 4.0 V8 bi-turbo (Non OPF\/GPF US\/ROW Models) (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S8 D5 4.0 TFSI V8 Saloon\/Sedan - Long Wheel Base (Non OPF\/GPF US\/ROW Models) (2020 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S8 D5 4.0 TFSI V8 Saloon\/Sedan - Standard Wheel Base (Non OPF\/GPF US\/ROW Models) (2020 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (OPF\/GPF Models), which needs the \u003ca href=\"\/products\/milltek-downpipes-with-cat-bypass-audi-rs6-c8-4-0-v8-bi-turbo-opf-gpf-19\"\u003eMilltek Downpipes \u0026amp; Cat Bypass Pipes Audi RS6 C8 4.0 V8 bi-turbo OPF\/GPF 19+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 3.5 to 4.5 hours. Some versions: Fits to Milltek Sport Cat Back System - Requires Stage 2 ECU Software. Some versions: Fits to OE Catback Back System - Requires Stage 2 ECU Software. 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-front-pipe-back-exhaust-audi-rs6-c8-4-0-v8-bi-turbo-opf-gpf-19\"\u003eMilltek Front Pipe-back Exhaust Audi RS6 C8 4.0 V8 Bi-Turbo OPF\/GPF 19+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi RS7 C8 4.0 V8 bi-turbo (Non OPF\/GPF US\/ROW Models)?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi RS7 C8 4.0 V8 bi-turbo (Non OPF\/GPF US\/ROW Models) as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (OPF\/GPF Models)?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-downpipes-with-cat-bypass-audi-rs6-c8-4-0-v8-bi-turbo-opf-gpf-19\"\u003eMilltek Downpipes \u0026amp; Cat Bypass Pipes Audi RS6 C8 4.0 V8 bi-turbo OPF\/GPF 19+\u003c\/a\u003e.\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: \"Fits to Milltek Sport Cat Back System - Requires Stage 2 ECU Software\". 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\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. 3.5 to 4.5 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":"Fits Milltek Cat Back Only","offer_id":56392748597633,"sku":"MIL-SSXAU907","price":2714.1,"currency_code":"GBP","in_stock":true},{"title":"Fits OE System Only","offer_id":56392748630401,"sku":"MIL-SSXAU908","price":2700.42,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU907_1_f566bbba-6321-4552-8b4f-b1dfc77ae561.jpg?v=1791891667"},{"product_id":"milltek-sports-cat-downpipes-audi-s8-d5-4-0-tfsi-v8-saloon-standard-wheel-base-non-opf-gpf-us-row-20","title":"Milltek Sports Cat Downpipes Audi S8 D5 4.0 TFSI V8 Saloon Standard Wheel Base Non-OPF\/GPF US ROW 20+","description":"\u003ch2\u003eMilltek Downpipes \u0026amp; Sports Cats for Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (Non OPF\/GPF Models - USA\/ROW Models) (2020 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 S8 D5 4.0 TFSI V8 Saloon\/Sedan - Standard Wheel Base (Non OPF\/GPF US\/ROW Models). 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. It's offered in versions to suit the factory or a Milltek system, so you can pick the setup that suits how the car's used.\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 Large Bore Downpipes and Hi-Flow Sports Cats\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 80mm (3.15\")\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. 3.5 to 4.5 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\u003e80mm (3.15\") 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 RS6 C8 4.0 V8 bi-turbo in Performance Edition (Non OPF\/GPF Models - USA\/ROW Models) (2020 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi RS7 C8 4.0 V8 bi-turbo (Non OPF\/GPF US\/ROW Models) (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S8 D5 4.0 TFSI V8 Saloon\/Sedan - Long Wheel Base (Non OPF\/GPF US\/ROW Models) (2020 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S8 D5 4.0 TFSI V8 Saloon\/Sedan - Standard Wheel Base (Non OPF\/GPF US\/ROW Models) (2020 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (OPF\/GPF Models), which needs the \u003ca href=\"\/products\/milltek-sports-cat-downpipes-audi-rs6-c8-4-0-v8-bi-turbo-opf-gpf-19\"\u003eMilltek Downpipes \u0026amp; Sports Cats Audi RS6 C8 4.0 V8 bi-turbo OPF\/GPF 19+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 3.5 to 4.5 hours. Some versions: Fits to Milltek Sport Catback Back System - Requires Stage 2 ECU Software. Some versions: Fits to OE Cat Back System - Requires Stage 2 ECU Software. 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-front-pipe-back-exhaust-audi-rs6-c8-4-0-v8-bi-turbo-opf-gpf-19\"\u003eMilltek Front Pipe-back Exhaust Audi RS6 C8 4.0 V8 Bi-Turbo OPF\/GPF 19+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi RS7 C8 4.0 V8 bi-turbo (Non OPF\/GPF US\/ROW Models)?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi RS7 C8 4.0 V8 bi-turbo (Non OPF\/GPF US\/ROW Models) as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (OPF\/GPF Models)?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-sports-cat-downpipes-audi-rs6-c8-4-0-v8-bi-turbo-opf-gpf-19\"\u003eMilltek Downpipes \u0026amp; Sports Cats Audi RS6 C8 4.0 V8 bi-turbo OPF\/GPF 19+\u003c\/a\u003e.\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\u003eYes. Milltek notes: \"Fits to Milltek Sport Catback Back System - Requires Stage 2 ECU Software\". 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\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. 3.5 to 4.5 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":"Fits Milltek Cat Back Only","offer_id":56392748663169,"sku":"MIL-SSXAU909","price":4477.99,"currency_code":"GBP","in_stock":true},{"title":"Fits OE System Only","offer_id":56392748695937,"sku":"MIL-SSXAU910","price":4464.3,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU909_1_2f9a047e-3e58-4339-8ca8-e48c0e052144.jpg?v=1791891668"},{"product_id":"milltek-downpipes-with-cat-bypass-audi-s8-d5-4-0-tfsi-v8-saloon-opf-gpf-uk-euro-20","title":"Milltek Downpipes with Cat Bypass Audi S8 D5 4.0 TFSI V8 Saloon OPF\/GPF UK Euro 20+","description":"\u003ch2\u003eMilltek Downpipes \u0026amp; Cat Bypass Pipes for Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (OPF\/GPF Models) (2019 onwards) – Maximum Flow, Motorsport Use\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's large-bore downpipe and de-cat for the Audi S8 D5 4.0 TFSI V8 Saloon\/Sedan (OPF\/GPF UK\/Euro Models). 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. It's offered in versions to suit the factory or a Milltek system, so you can pick the setup that suits how the car's used.\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 Large-bore Downpipes and Cat Bypass Pipes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 80mm (3.15\")\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. 3.5 to 4.5 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\u003e80mm (3.15\") 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 RS6 C8 4.0 V8 bi-turbo in Performance Edition (OPF\/GPF Models) (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi RS7 C8 4.0 V8 bi-turbo (OPF\/GPF Models) (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S8 D5 4.0 TFSI V8 Saloon\/Sedan (OPF\/GPF UK\/Euro Models) (2020 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (Non OPF\/GPF Models - USA\/ROW Models), which needs the \u003ca href=\"\/products\/milltek-downpipes-with-cat-bypass-audi-rs6-c8-4-0-v8-bi-turbo-non-opf-gpf-usa-row-20\"\u003eMilltek Downpipes \u0026amp; Cat Bypass Pipes Audi RS6 C8 4.0 V8 bi-turbo Non OPF\/GPF USA ROW 20+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 3.5 to 4.5 hours. Some versions: Fits to Milltek Sport OPF\/GPF Back System include OPF\/GPF Bypass - Requires Stage 2 ECU Software. Some versions: Fits to OE OPF\/GPF Back System include OPF\/GPF Bypass - Requires Stage 2 ECU Software. 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\u003eWill it fit the Audi RS7 C8 4.0 V8 bi-turbo (OPF\/GPF Models)?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi RS7 C8 4.0 V8 bi-turbo (OPF\/GPF Models) as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (Non OPF\/GPF Models - USA\/ROW Models)?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-downpipes-with-cat-bypass-audi-rs6-c8-4-0-v8-bi-turbo-non-opf-gpf-usa-row-20\"\u003eMilltek Downpipes \u0026amp; Cat Bypass Pipes Audi RS6 C8 4.0 V8 bi-turbo Non OPF\/GPF USA ROW 20+\u003c\/a\u003e.\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: \"Fits to Milltek Sport OPF\/GPF Back System include OPF\/GPF Bypass - Requires Stage 2 ECU Software\". 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\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. 3.5 to 4.5 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":"Fits Milltek Cat Back Only","offer_id":56392748728705,"sku":"MIL-SSXAU870","price":2689.2,"currency_code":"GBP","in_stock":true},{"title":"Fits OE System Only","offer_id":56392748761473,"sku":"MIL-SSXAU871","price":2675.52,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU870_1_65c881ee-6e69-41e0-880a-2174c26495d5.jpg?v=1791891669"},{"product_id":"milltek-sports-cat-downpipes-audi-s8-d5-4-0-tfsi-v8-saloon-opf-gpf-uk-euro-20","title":"Milltek Sports Cat Downpipes Audi S8 D5 4.0 TFSI V8 Saloon OPF\/GPF UK Euro 20+","description":"\u003ch2\u003eMilltek Downpipes \u0026amp; Sports Cats for Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (OPF\/GPF Models) (2019 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 S8 D5 4.0 TFSI V8 Saloon\/Sedan (OPF\/GPF UK\/Euro Models). 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. It's offered in versions to suit the factory or a Milltek system, so you can pick the setup that suits how the car's used.\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 Large Bore Downpipes and Hi-Flow Sports Cats\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 80mm (3.15\")\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. 3.5 to 4.5 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\u003e80mm (3.15\") 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 RS6 C8 4.0 V8 bi-turbo in Performance Edition (OPF\/GPF Models) (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi RS7 C8 4.0 V8 bi-turbo (OPF\/GPF Models) (2019 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S8 D5 4.0 TFSI V8 Saloon\/Sedan (OPF\/GPF UK\/Euro Models) (2020 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (Non OPF\/GPF Models - USA\/ROW Models), which needs the \u003ca href=\"\/products\/milltek-sports-cat-downpipes-audi-rs6-c8-4-0-v8-bi-turbo-non-opf-gpf-usa-row-20\"\u003eMilltek Downpipes \u0026amp; Sports Cats Audi RS6 C8 4.0 V8 bi-turbo Non OPF\/GPF USA ROW 20+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 3.5 to 4.5 hours. Some versions: Fits to Milltek Sport OPF\/GPF Back System include OPF\/GPF Bypass - Requires Stage 2 ECU Software. Some versions: Fits to OE OPF\/GPF Back System include OPF\/GPF Bypass - Requires Stage 2 ECU Software. 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\u003eWill it fit the Audi RS7 C8 4.0 V8 bi-turbo (OPF\/GPF Models)?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi RS7 C8 4.0 V8 bi-turbo (OPF\/GPF Models) as well as the other models in the fitment list above.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (Non OPF\/GPF Models - USA\/ROW Models)?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-sports-cat-downpipes-audi-rs6-c8-4-0-v8-bi-turbo-non-opf-gpf-usa-row-20\"\u003eMilltek Downpipes \u0026amp; Sports Cats Audi RS6 C8 4.0 V8 bi-turbo Non OPF\/GPF USA ROW 20+\u003c\/a\u003e.\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\u003eYes. Milltek notes: \"Fits to Milltek Sport OPF\/GPF Back System include OPF\/GPF Bypass - Requires Stage 2 ECU Software\". 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\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. 3.5 to 4.5 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":"Fits Milltek Cat Back Only","offer_id":56392748859777,"sku":"MIL-SSXAU868","price":4453.07,"currency_code":"GBP","in_stock":true},{"title":"Fits OE System Only","offer_id":56392748892545,"sku":"MIL-SSXAU869","price":4439.39,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU868_1.jpg?v=1791891680"},{"product_id":"milltek-filter-back-exhaust-audi-s8-d5-4-0-tfsi-v8-saloon-opf-gpf-uk-euro-20","title":"Milltek Filter Back Exhaust Audi S8 D5 4.0 TFSI V8 Saloon OPF\/GPF UK Euro 20+","description":"\u003ch2\u003eMilltek Filter-back Exhaust for Audi S8 D5 4.0 TFSI V8 Saloon\/Sedan - Standard Wheel Base (Non OPF\/GPF US\/ROW Models) (2020 onwards) – Sharper Sound, Filter Retained\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's particulate filter-back system for the Audi S8 D5 4.0 TFSI V8 Saloon\/Sedan (OPF\/GPF UK\/Euro Models). It replaces everything downstream of the factory diesel or petrol particulate filter with wider-bore pipework and re-tuned silencers, cutting back pressure and sharpening the exhaust note. The filter itself is left exactly where the manufacturer fitted it, so emissions equipment is unaffected. It's offered in non-resonated or resonated EC approved versions and 5 tailpipe finishes, so you can pick the setup that suits how the car's used.\u003c\/p\u003e\n\u003cp\u003eIt's the right choice if you want a sportier sound and a genuine, if modest, flow improvement on a filter-equipped car, without going anywhere near the parts of the system that keep it emissions-compliant.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Particulate Filter-back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 80mm (3.15\")\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. 2.5 to 3.5 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\u003e80mm (3.15\") pipework\u003c\/li\u003e\n\u003cli\u003eFits behind the factory particulate filter, which stays in place\u003c\/li\u003e\n\u003cli\u003eChoice of 5 tailpipe finishes: GT-115 Burnt Titanium, GT-115 Cerakote Black, GT-115 Polished, GT-115 Titanium, JET-115 Carbon Fibre\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 S8 D5 4.0 TFSI V8 Saloon\/Sedan - Standard Wheel Base (Non OPF\/GPF US\/ROW Models) (2020 onwards)\u003c\/li\u003e\n\u003cli\u003eAudi S8 D5 4.0 TFSI V8 Saloon\/Sedan (OPF\/GPF UK\/Euro Models) (2020 onwards)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Audi S8 D5 OPF\/GPF US\/ROW 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. 2.5 to 3.5 hours. Some versions: Non-Resonated (Louder) OPF\/GPF Back System (Twin 80mm) with GT-115 Burnt Titanium Trims (Does Not Require Cutting of the OE System). Some versions: Non-Resonated (Louder) OPF\/GPF Back System (Twin 80mm) with GT-115 Cerakote Black Trims (Does Not Require Cutting of the OE System). Some versions: Non-Resonated (Louder) OPF\/GPF Back System (Twin 80mm) with GT-115 Polished Trims (Does Not Require Cutting of the OE System). Some versions: Non-Resonated (Louder) OPF\/GPF Back System (Twin 80mm) with GT-115 Titanium Trims (Does Not Require Cutting of the OE System). 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: GT-115 Burnt Titanium, GT-115 Cerakote Black, GT-115 Polished, GT-115 Titanium, JET-115 Carbon Fibre. The finish is cosmetic and does not change the sound.\u003c\/p\u003e\n\u003ch3\u003eWill it fit the Audi S8 D5 4.0 TFSI V8 Saloon\/Sedan (OPF\/GPF UK\/Euro Models)?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek lists this part for the Audi S8 D5 4.0 TFSI V8 Saloon\/Sedan (OPF\/GPF UK\/Euro Models) 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 particulate filter, so no software changes are needed.\u003c\/p\u003e\n\u003ch3\u003eDoes it keep the factory particulate filter?\u003c\/h3\u003e\n\u003cp\u003eYes. It fits behind the factory particulate filter, which stays in place.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 2.5 to 3.5 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":"Non-Resonated \/ GT-115 Burnt Titanium","offer_id":56392748925313,"sku":"MIL-SSXAU951","price":5079.74,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-115 Cerakote Black","offer_id":56392748958081,"sku":"MIL-SSXAU949","price":4713.97,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-115 Polished","offer_id":56392748990849,"sku":"MIL-SSXAU948","price":4424.48,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ GT-115 Titanium","offer_id":56392749023617,"sku":"MIL-SSXAU950","price":4953.44,"currency_code":"GBP","in_stock":true},{"title":"Non-Resonated \/ JET-115 Carbon Fibre","offer_id":56392749056385,"sku":"MIL-SSXAU952","price":5012.27,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-115 Burnt Titanium","offer_id":56392749089153,"sku":"MIL-SSXAU946","price":5247.84,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-115 Cerakote Black","offer_id":56392749121921,"sku":"MIL-SSXAU944","price":4882.07,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-115 Polished","offer_id":56392749154689,"sku":"MIL-SSXAU943","price":4592.58,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ GT-115 Titanium","offer_id":56392749187457,"sku":"MIL-SSXAU945","price":5121.54,"currency_code":"GBP","in_stock":true},{"title":"Resonated - EC Approved \/ JET-115 Carbon Fibre","offer_id":56392749220225,"sku":"MIL-SSXAU947","price":5180.37,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXAU951_1.jpg?v=1791891696"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/collections\/audi-s8.jpg?v=1791897524","url":"https:\/\/milltekexhaustshop.com\/collections\/audi-s8-performance-exhaust-systems.oembed","provider":"Milltek Exhaust Shop","version":"1.0","type":"link"}