{"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","url":"https:\/\/milltekexhaustshop.com\/products\/milltek-sports-cat-downpipes-audi-s8-d5-4-0-tfsi-v8-saloon-opf-gpf-uk-euro-20","provider":"Milltek Exhaust Shop","version":"1.0","type":"link"}