Catback Milltek Audi S4 B9 2016-2018, S5 F5 2017-2018 - No Primary Muffler - Quad GT90 Titanium Outlets

Milltek Sport Exhaust System for Audi S4 B9 / S5 F5

Does the factory sound of your Audi S4 B9 / S5 F5 leave you wanting more? This Milltek Sport stainless steel exhaust system is the most requested choice among owners: more presence, a true signature sound, and long-lasting build quality.

Technical specifications

• Milltek part number: SSXAU657
• Part type: Exhaust system
• Configuration: with valves
• Detail: No primary muffler, quad GT90 titanium tips
• Tube diameter: 63.5 mm
• Outlets: 4 GT90 outlets, 90 mm
• Tip finish: titanium finish
• 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?

What owners mention most often is fit quality and a deep sound that is present but never harsh. This is the hallmark of Milltek Sport, a British manufacturer specializing in stainless steel exhausts.

Further reading

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