Milltek Cat Back Exhaust Audi S4 3.0 Turbo V6 B9 Saloon Avant Non-GPF Non Sport Diff RHD 16+

Milltek Cat-back Exhaust for Audi S4 3.0 Turbo V6 B9 - Saloon/Sedan & Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards) – Sharper Sound, Reduced Back Pressure

This is Milltek's cat-back system for the Audi S4 3.0 Turbo V6 B9 - Saloon/Sedan & Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only. 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 11 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: 63.5mm (2.5")
• 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
• 63.5mm (2.5") pipework
• Replaces the standard exhaust from the catalytic converter back, so the factory cat is retained
• Choice of 11 tailpipe finishes: Cerakote Black Oval, GT-100 Burnt Titanium, GT-100 Cerakote Black, GT-100 Polished, GT-100 Titanium, GT-90 Burnt Titanium, GT-90 Cerakote Black, GT-90 Polished and more
• EC approved versions available
• Resonated (quieter) or non-resonated (louder) versions
• Designed, developed and manufactured in the UK by Milltek Sport

Fitment

• Audi S4 3.0 Turbo V6 B9 - Saloon/Sedan & Avant (NON GPF ONLY - Non Sport Diff Models) - Right Hand Drive Cars Only (2016 onwards)

Not suitable for: 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 - Sport Diff Models Only & Without Brace Bars) - Right Hand Drive Cars Only, which needs the Milltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon & Avant (NON GPF - Sport Diff & Without Brace Bars) - Right Hand Drive Cars 16+; the Audi S4 3.0 Turbo V6 B9 - Saloon/Sedan & Avant (NON GPF ONLY - Sport Diff Models Only & Without Brace Bars) - Left Hand Drive Cars Only, which needs the Milltek Cat-back Exhaust Audi S4 3.0 Turbo V6 B9 - Saloon & Avant (NON GPF - Sport Diff & Without Brace Bars) - Left Hand Drive Cars 16+.

Installation

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.

Which tailpipe finishes are available?

You can choose from: Cerakote Black Oval, GT-100 Burnt Titanium, GT-100 Cerakote Black, GT-100 Polished, GT-100 Titanium, GT-90 Burnt Titanium, GT-90 Cerakote Black, GT-90 Polished, GT-90 Titanium, JET-100 Carbon Fibre, Polished Oval. The finish is cosmetic and does not change the sound.

Does it fit the Audi S4 3.0 Turbo V6 B9 - Saloon/Sedan & Avant (NON GPF ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only?

No. For that car, choose 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+.

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.

What is it made from?

T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.

Is there a warranty?

Yes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.