Cat-Back Milltek Audi RS4 B8 4.2 FSI V8 450hp 2012-2015 - No Primary Mufflers and Non-Resonated

Milltek Sport exhaust system for Audi RS4 B8

Swapping the stock system for a Milltek Sport exhaust brings back the character the factory setup holds back on your Audi RS4 B8: a rounder sound at idle that opens up cleanly through the rev range, without gimmicks.

Technical specifications

• Milltek part number: SSXAU338
• Part type: Exhaust system
• Configuration: non-resonated (no resonator), with valves
• Detail: No primary mufflers and no resonator
• Tube diameter: 70 mm (2.75 in.)
• Exhaust tips: original exhaust tips retained
• Installation information: With active valves
• Material: aerospace-grade stainless steel
• Manufacturer: Milltek Sport (UK)

Compatible vehicles

• Audi RS4 B8 4.2 FSI V8 450 hp (Quattro, Wagon, 2012-2015)

Not sure it fits your vehicle? Contact us with your chassis number (VIN) before ordering.

Most frequently asked questions

• Resonated or non-resonated? This version is non-resonated (no resonator): it is the most expressive, with more crackle on throttle lift-off. On the other hand, a slight drone may appear at certain engine speeds on long trips. If you do a lot of highway driving, compare it with the resonated version.
• And what about the neighbors in the morning? The valves are controlled as on the original system: the exhaust stays closed and quiet at startup or in comfort mode, and fully open in sport mode.
• Installation: the system uses the original mounting points. A well-equipped repair shop typically fits it in one to two hours.

Why choose Milltek Sport?

Milltek Sport designs and manufactures its exhausts in England, using mandrel-bent tubing to preserve the inner diameter and a fitment developed for the vehicle. The result: a clean installation with no adaptation required, and a sound tuned to stay pleasant for daily driving.

Further reading

• Resonated or non-resonated cat-back exhaust: which one should you choose for your car?
• Valved exhaust systems: how do they work and should you keep them?