Cat-Back Milltek Audi S4 B9, S5 F5 - ECE Homologated - With Primary Muffler - Quad GT90 Cerakote Black

Milltek Sport exhaust system for Audi S4 B9 / S5 F5

Replacing the factory exhaust with a Milltek Sport system brings back the character that the stock engine of your Audi S4 B9 / S5 F5 holds back: a rounder sound at idle that opens up cleanly through the rev range, with no artifice.

Technical specifications

• Milltek part number: SSXAU645
• Part type: Exhaust system
• Configuration: with valves
• Details: ECE homologated - With primary muffler - Quad GT90 black Cerakote
• Tube diameter: 63.5 mm
• Outlets: 4 GT90 outlets, 90 mm
• Tip finish: black Cerakote (high-temperature ceramic)
• Fitting information: Models without Sport Diff - With valves
• Material: aerospace-grade stainless steel
• Homologation: ECE / EC homologated
• Manufacturer: Milltek Sport (UK)

Compatible vehicles

• Audi S4 B9 3.0 Turbo V6 (without Sport Differential, Saloon, Avant, 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.

Our most frequently asked questions

• What about the neighbors in the morning? The valves are controlled as on the original: closed and quiet at startup or in comfort mode, fully open in sport mode.
• Homologation: this system is ECE / EC homologated, a real advantage for driving with peace of mind and passing the contrôle technique.
• 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?

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

Going further

• Valved exhausts: how they work and should you keep them?
• Exhaust systems and the contrôle technique in France