Cat-back Valve Sonic Milltek Audi S4 B8, S5 8T - Valve Sonic version - resonated + muffler - dual oval black Cerakote tips

Milltek Sport exhaust system for Audi S4 B8 / S5 8T

On the Audi S4 B8 / S5 8T, the original exhaust is designed for quietness and regulations. This Milltek Sport stainless steel exhaust system brings back the engine's voice with a full, deep, refined tone, the one that built the reputation of the British brand.

Technical specifications

• Milltek part number: SSXAU380
• Part type: Exhaust system
• Configuration: resonated (with resonator), with valves
• Details: Valve Sonic version - with resonator + rear valved muffler - dual oval black Cerakote tips
• Tube diameter: 60.3 mm
• Outlets: 150 x 95mm oval outlet
• Tip finish: black Cerakote (high-temperature ceramic)
• Fitting information: ValveSonic Electronic Valved System
• Material: aerospace-grade stainless steel
• Manufacturer: Milltek Sport (UK)

Compatible vehicles

• Audi S4 B8 3.0 TFSi 333hp (2009-2012)
• Audi S5 8T 3.0 TFSI (S-Tronic, Coupe - Cabriolet, 2009-2011)

Not sure about compatibility with your vehicle? Contact us with your VIN before ordering.

Our most frequently asked questions

• Highway drone? It's the number one concern on forums. This version keeps a resonator: the sound stays full under acceleration, but the car stays calm at steady cruising speed, ideal for everyday driving.
• What about the neighbors in the morning? The valves are controlled as on the original system: closed and quiet on startup or in comfort mode, fully open in sport mode.
• Fitting: the system uses the original mounting points. A workshop typically fits it in one to two hours.

Why choose Milltek Sport?

Milltek Sport designs and manufactures its exhausts in England, with mandrel-bent tubes to preserve the internal diameter and a fit developed on the vehicle. Result: a clean installation with no modifications needed, and a sound tuned to stay pleasant every day.

For going further

• Resonated or non-resonated cat-back: which one should you choose for your car?
• Valved exhaust: how does it work, and should you keep the valves?