Milltek Cat-Back Audi S4 B9, S5 F5 - No Primary Muffler - Quad GT100 Black Cerakote Tips - w/o Sport Diff.

Milltek Sport Exhaust System for Audi S4 B9 / S5 F5

On the Audi S4 B9 / S5 F5, the original exhaust is designed for quiet operation and regulatory compliance. This Milltek Sport stainless steel exhaust system gives the engine its voice back with a refined, full and deep sound, the one that built the reputation of the British brand.

Technical Specifications

• Milltek Part Number: SSXAU651
• Part Type: Exhaust System
• Configuration: with valves
• Details: No primary muffler - Quad GT100 black Cerakote tips
• Tube Diameter: 63.5 mm
• Outlets: 4 GT100 outlets, 100 mm
• Tip Finish: black Cerakote (high-temperature ceramic)
• Fitting Information: Non-Sport Diff Models - With Valves
• Material: aerospace-grade stainless steel
• Manufacturer: Milltek Sport (UK)

Compatible Vehicles

• Audi S4 B9 3.0 Turbo V6 (without Sport Differential, Sedan - Wagon, 2016-2018)
• Audi S5 F5 3.0 V6 T (without Sport Differential, Sportback, 2017-2018)

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

Frequently Asked Questions

• 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.
• Installation: the system uses the original mounting points. A properly equipped repair shop 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. It is the signature of Milltek Sport, a British manufacturer specializing in stainless steel exhausts.

Further Reading

• Valved Exhaust Systems: How Do They Work and Should You Keep Them?