Milltek Cat-back Exhaust for Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (Non OPF/GPF Models - USA/ROW Models) (2020 onwards) – Sharper Sound, Reduced Back Pressure
This is Milltek's cat-back system for the Audi RS7 C8 4.0 V8 bi-turbo (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, 2 tailpipe finishes and a choice of modification (Not Required, Required), so you can pick the setup that suits how the car's used.
It'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.
Specifications
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System Type: Cat-back
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Pipe Diameter: 80mm (3.15")
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EC Approved: No
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Race System: No
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Fitting Time: approx. 3 to 3.5 hours (Milltek figure)
Key Features
- Made from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration
- Mandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow
- 80mm (3.15") pipework
- Replaces the standard exhaust from the catalytic converter back, so the factory cat is retained
- Choice of 2 tailpipe finishes: Cerakote Black Oval, Polished Oval
- Resonated (quieter) or non-resonated (louder) versions
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (Non OPF/GPF Models - USA/ROW Models) (2020 onwards)
- Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (OPF/GPF Models) (2019 onwards)
- Audi RS7 C8 4.0 V8 bi-turbo (Non OPF/GPF US/ROW Models) (2019 onwards)
- Audi RS7 C8 4.0 V8 bi-turbo (OPF/GPF Models) (2019 onwards)
Not every version fits every car in this list. Check the fitment shown for the option you select.
Not suitable for: the Audi RS6 C8 4.0 V8 bi-turbo (Non OPF/GPF Models- USA/ROW) - Signature Series Titanium, which needs the Milltek Filter-back Exhaust Audi RS6 C8 4.0 V8 Bi-Turbo OPF/GPF Signature Series Titanium 19+.
Installation
Milltek quotes a fitting time of approx. 3 to 3.5 hours. Some versions: Cat Back System Non Resonated (Twin 80mm) with Cerakote Black Oval Trims - (Loudest) Does not requires cutting of the OE system. Some versions: Cat Back System Non Resonated (Twin 80mm) with Cerakote Black Oval Trims - (Loudest) Requires OE system to be Cut - Designed for Customers who will be upgrading to Turbo Back in the Future. Some versions: Cat Back System Non Resonated (Twin 80mm) with Polished Oval Trims (Loudest) - Does not require cutting of the OE System. Some versions: Cat Back System Non Resonated (Twin 80mm) with Polished Oval Trims (Loudest) - Requires OE system to be Cut - Designed for Customers who will be upgrading to Turbo Back in the Future. We recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.
Upgrade Further
Also available from Milltek for this car: Milltek Downpipes & Cat Bypass Pipes Audi RS6 C8 4.0 V8 bi-turbo Non OPF/GPF USA ROW 20+.
What's the difference between the resonated and non-resonated versions?
The 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.
Which tailpipe finishes are available?
You can choose from: Cerakote Black Oval, Polished Oval. The finish is cosmetic and does not change the sound.
Will it fit the Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (OPF/GPF Models)?
Yes. Milltek lists this part for the Audi RS6 C8 4.0 V8 bi-turbo in Performance Edition (OPF/GPF Models) as well as the other models in the fitment list above.
Does it fit the Audi RS6 C8 4.0 V8 bi-turbo (Non OPF/GPF Models- USA/ROW) - Signature Series Titanium?
No. For that car, choose the Milltek Filter-back Exhaust Audi RS6 C8 4.0 V8 Bi-Turbo OPF/GPF Signature Series Titanium 19+.
Is it road legal?
Milltek 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.
Do I need a remap?
No. It fits behind the factory catalytic converter, so no software changes are needed.
Does it keep the factory catalytic converter?
Yes. It fits behind the factory catalytic converter, which stays in place.
How long does it take to fit?
Milltek quotes approx. 3 to 3.5 hours.
What is it made from?
T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.
