Milltek Cat-Back Audi RS4 B9 2018-2025, RS5 B9 2018-2019 - no primary muffler, non-resonated - Dual Oval Polished Tips

Milltek Sport Exhaust System for Audi RS4 B9 / RS5 B9

Swapping the factory system for a Milltek Sport exhaust brings back the character that the Audi RS4 B9 / RS5 B9 V6 engine holds back from the factory: a rounder tone at idle that opens up cleanly through the rev range, without gimmicks.

Technical specifications

• Milltek part number: SSXAU752
• Part type: Exhaust system
• Configuration: non-resonated (no resonator), with valves, Race version
• Details: No primary muffler and no resonator, dual oval polished stainless steel outlets
• Tube diameter: 70 mm (2.75 in)
• Outlets: 2 oval outlets
• Tip finish: polished stainless steel
• Fitment information: Race version (Race rear muffler) + Loud - With valves
• Material: aerospace-grade stainless steel
• Manufacturer: Milltek Sport (UK)

Compatible vehicles

• Audi RS4 B9 2.9 V6 T (Avant, 2018-2025, non-FAP)
Audi RS5 B9 2.9 V6 T (Sportback, 2018-2019, non-FAP)

Frequently asked questions
• Resonated or non-resonated? This version is non-resonated (no resonator): it is the most expressive, with more crackle on lift-off. The trade-off is a slight drone that can appear at certain engine speeds on long trips. If you do a lot of highway driving, compare it with the resonated version.
• What about the neighbors in the morning? The valves are controlled as on the factory system: closed and quiet at startup or in comfort mode, fully open in sport mode.
• Race version: the loudest in the range, built for the track and for drivers who want the sensation. It is not meant for quiet long-distance driving.
• Installation: the system uses the original mounting points. A shop with the proper equipment typically fits it in one to two hours.

Why choose Milltek Sport?

What customers mention most often in their feedback is fit quality and a deep tone that is present but never harsh. That is the Milltek Sport signature, from the British maker specializing in stainless steel exhausts.

Further reading

• Resonated or non-resonated cat-back exhaust: which one should you choose for your car?
• Exhaust valves: how they work and whether to keep them