Cat-Back Race Milltek Audi S4 B8, S5 8T - with Primary, Resonated + Rear Muffler Bypass - Quad GT80 Black Cerakote Tips

Milltek Sport Exhaust System for Audi S4 B8 / S5 8T

On the Audi S4 B8 / S5 8T, the factory exhaust is engineered for quiet operation and regulatory compliance. This Milltek Sport stainless steel exhaust system restores the engine's voice with a full, deep, refined sound, the kind that built the reputation of this English brand.

Technical specifications

• Milltek part number: SSXAU557
• Part type: Exhaust system
• Configuration: resonated (with resonator), Race version
• Details: Race version - with primary and resonator + rear muffler bypass - quad GT80 black Cerakote outlets
• Tube diameter: 60.3 mm
• Outlets: 2 GT80 outlets of 80 mm
• Tip finish: black Cerakote (high-temperature ceramic)
• Fitting information: Race version
• Material: aerospace-grade stainless steel
• Manufacturer: Milltek Sport (United Kingdom)

Compatible vehicles

• Audi S4 B8 3.0 TFSi 333 hp (2009-2012)
• Audi S5 8T 3.0 TFSI (Sportback, 2010-2011)

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

Our 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 exhaust stays unobtrusive at steady speed, ideal for daily driving.
• Race version: the loudest in the range, designed for the track and for enthusiasts. It is not meant for quiet long-distance driving.
• Fitting: the system uses the original mounting points. A workshop with the right 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 tubing to preserve the inner diameter and a fit developed on the vehicle. The result: a clean installation with no modification needed, and a sound tuned to remain pleasant for everyday use.

Going further

• Resonated or non-resonated cat-back exhaust: which one for your car?