Cat-back Milltek Audi RS4 B9 2018-2025 - ECE Homologated - with primary muffler, resonated - Dual Oval Polished Tips

Milltek Sport exhaust system for Audi RS4 B9

Does the factory sound of your Audi RS4 B9 leave you wanting more? This Milltek Sport stainless steel exhaust is the option owners request most often: more presence, a true sound signature and long-lasting build quality.

Technical specifications

• Milltek part number: SSXAU749
• Part type: Exhaust system
• Configuration: resonated (with resonator), with valves
• Detail: ECE homologated - With primary and resonator mufflers - Dual oval polished stainless steel tips
• Tube diameter: 70 mm (2.75 in)
• Outlets: 2 oval outlets
• Tip finish: polished stainless steel
• Fitment information: ECE version - With valves
• Material: aerospace-grade stainless steel
• Homologation: ECE / EC homologated
• Manufacturer: Milltek Sport (UK)

Compatible vehicles

• Audi RS4 B9 2.9 V6 T (Wagon, 2018-2025, without DPF)

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

Most frequently asked questions

• Highway drone? It is the number one concern on forums. This version keeps a resonator: the sound stays full under acceleration, while the system remains calm at steady cruising speed, ideal for daily driving.
• And the neighbors in the morning? The valves are controlled as on the original: closed and quiet on startup or in comfort mode, fully open in sport mode.
• Homologation: this system is ECE / EC homologated, a real advantage for driving with peace of mind and passing the technical inspection (contrôle technique).
• Fitment: the system uses the original mounting points. A repair shop with the proper equipment typically fits it in one to two hours.

Why choose Milltek Sport?

Milltek Sport designs and manufactures its exhausts in England, using mandrel-bent tubes to preserve the internal diameter and a fit developed on the vehicle. The result: a clean installation with no modifications required, and a sound tuned to stay pleasant for everyday use.

Further reading

• Resonated or non-resonated cat-back exhaust: which one to choose for your car?
• Exhaust systems with valves: how they work and whether to keep them?
• Exhaust systems and technical inspection (contrôle technique) in France