Cat-back Milltek Audi S4 B9 2016-2018, S5 F5 2017-2018 - No primary muffler - Quad GT90 Cerakote Black

Milltek Sport Exhaust System for Audi S4 B9 / S5 F5

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

Technical specifications

• Milltek part number: SSXAU658
• Part type: Exhaust system
• Configuration: with valves
• Detail: No primary muffler, quad GT90 tips in Cerakote black
• Tube diameter: 63.5 mm
• Outlets: 4 GT90 outlets, 90 mm
• Tip finish: Cerakote black (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, Saloon, Estate, 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 are controlled as on the factory system: closed and discreet at startup or in comfort mode, fully open in sport mode.
• Installation: the system uses the factory mounting points. A shop with the right equipment usually completes the fitting 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 itself. The result: a clean installation with no modifications, and a sound tuned to remain pleasant for everyday driving.

Further reading

• Exhaust valves: how they work and should you keep them?