Milltek Cat-Back Audi RS4 B9, RS5 B9 - no primary muffler, non-resonated - Dual Oval Black Cerakote Tips

Milltek Sport Exhaust System for Audi RS4 B9 / RS5 B9

Replacing the original system with a Milltek Sport exhaust brings back the character that the factory setup muffles in your Audi RS4 B9 / RS5 B9: a rounder tone at idle that opens up cleanly through the rev range, without gimmicks.

Technical specifications

• Milltek part number: SSXAU751
• Part type: Exhaust system
• Configuration: non-resonated (no resonator), with valves, Race version
• Details: No primary muffler and no resonator, dual oval Cerakote black tips
• Tube diameter: 70 mm (2.75 inches)
• Outlets: 2 oval tips
• Tip finish: Cerakote black (high-temperature ceramic)
• 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, no DPF)
• Audi RS5 B9 2.9 V6 T (Sportback, 2018-2019, no DPF)

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

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 that a slight drone can appear at certain engine speeds on long journeys. 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 original system: closed and discreet at startup or in comfort mode, fully open in sport mode.
• Race version: the loudest in the range, designed for the track and driving enthusiasts. It is not made for quiet long-distance driving.
• Installation: the system uses the original mounting points. A repair shop with the right equipment usually 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 internal diameter and a fit developed on the vehicle itself. The result: a clean fit with no modifications needed, and a sound tuned to stay pleasant for everyday driving.

Further reading

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