Milltek Cat-back Exhaust for Audi S4 3.0 Supercharged V6 B8 (2009-2012) – Sharper Sound, Reduced Back Pressure
This is Milltek's cat-back system for the Audi S5 3.0 TFSI B8 Sportback. 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.
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
-
System Type: Cat-back
-
Pipe Diameter: 60.3mm (2.37")
-
Race System: No
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
- 60.3mm (2.37") pipework
- Replaces the standard exhaust from the catalytic converter back, so the factory cat is retained
- Choice of 3 tailpipe finishes: Cerakote Black Oval, GT-80 Cerakote Black, GT-80 Polished
- EC approved versions available
- Valved versions available for switchable volume
- Resonated (quieter) or non-resonated (louder) versions
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- Audi S4 3.0 Supercharged V6 B8 (2009-2012)
- Audi S5 3.0 TFSI B8 Sportback (2010-2011)
Not every version fits every car in this list. Check the fitment shown for the option you select.
Not suitable for: the Audi S4 3.0 Supercharged V6 B8.5, which needs the Milltek Cat-back Exhaust Audi S4 3.0 Supercharged V6 B8.5 12-16; the Audi S4 3.0 Turbo V6 B9 - Saloon/Sedan & Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only, which needs the Milltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon & Avant (NON GPF - Non Sport Diff Models) - Left Hand Drive Cars 16+; the Audi S4 3.0 Turbo V6 B9 - Saloon/Sedan & Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only, which needs the Milltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon & Avant (NON GPF - Non Sport Diff Models) - Right Hand Drive Cars 16+.
Installation
The 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.
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. Race versions are the loudest and are intended for track use.
Should I choose the valved or non-valved version?
The 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.
Which tailpipe finishes are available?
You can choose from: Cerakote Black Oval, GT-80 Cerakote Black, GT-80 Polished. The finish is cosmetic and does not change the sound.
Will it fit the Audi S5 3.0 TFSI B8 Sportback?
Yes. Milltek lists this part for the Audi S5 3.0 TFSI B8 Sportback as well as the other models in the fitment list above.
Does it fit the Audi S4 3.0 Supercharged V6 B8.5?
No. For that car, choose the Milltek Cat-back Exhaust Audi S4 3.0 Supercharged V6 B8.5 12-16.
Is it road legal?
Some versions are EC approved; check the EC Approved line in the specification for the option you choose.
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?
It depends on the version. Milltek's fitting time for each option is shown in its specification table.
