{"product_id":"milltek-downpipes-with-cat-bypass-audi-rs6-c8-4-0-v8-bi-turbo-non-opf-gpf-usa-row-20","title":"Milltek Downpipes with Cat Bypass Audi RS6 C8 4.0 V8 Bi-Turbo Non-OPF\/GPF USA 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 RS6 C8 4.0 V8 bi-turbo in Performance Edition (Non OPF\/GPF Models - USA\/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","offer_id":56392699773313,"sku":"MIL-SSXAU907","price":2714.1,"currency_code":"GBP","in_stock":true},{"title":"Fits OE System","offer_id":56392699806081,"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_afe350a3-9585-47a7-8d39-aae84d417020.jpg?v=1791890899","url":"https:\/\/milltekexhaustshop.com\/products\/milltek-downpipes-with-cat-bypass-audi-rs6-c8-4-0-v8-bi-turbo-non-opf-gpf-usa-row-20","provider":"Milltek Exhaust Shop","version":"1.0","type":"link"}