Catback Milltek Audi S4 B9, S5 F5 - No Primary Muffler - Quad Oval Cerakote Black Outlets - no sport diff.

Milltek Sport Exhaust System for Audi S4 B9 / S5 F5

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

Technical specifications

• Milltek part number: SSXAU656
• Part type: Exhaust system
• Configuration: with valves
• Details: Without primary muffler - quad oval black Cerakote outlets
• Pipe diameter: 63.5 mm
• Outlets: 4 oval outlets
• Tip finish: black Cerakote (high-temperature ceramic)
• Fitting information: Models without sport diff - with valves
• Material: aerospace-grade stainless steel
• Manufacturer: Milltek Sport (UK)

Compatible vehicles

• Audi S4 B9 3.0 Turbo V6 (without sport differential, sedan and 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 VIN before ordering.

Most frequently asked questions

• What about the neighbors in the morning? The valves operate as on the factory system: closed and quiet at startup or in comfort mode, fully open in sport mode.
• Installation: the system uses the factory mounting points. An equipped repair shop typically fits it in one to two hours.

Why choose Milltek Sport?

Milltek Sport designs and manufactures its exhaust systems in England, using mandrel-bent tubing to preserve the internal diameter and a fit developed on the vehicle. The result: a clean installation with no modification required, and a tone tuned to stay pleasant for everyday driving.

Going further

• Valved exhaust systems: how do they work, and should you keep them?