Cat-Back Milltek Audi S4 B9, S5 F5 - ECE Approved - With Primary Muffler - Polished Quad GT100 Tips - Without Sport Diff

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 engine of your Audi S4 B9 / S5 F5 muffles in stock form: a rounder tone at idle, opening up clearly through the rev range, without artifice.

Technical Specifications

• Milltek Part Number: SSXAU640
• Part Type: Exhaust System
• Configuration: With valves
• Details: ECE approved - With primary muffler - Quad GT100 polished stainless steel tips
• Tube Diameter: 63.5 mm
• Outlets: 4 GT100 outlets, 100 mm
• Tip Finish: polished stainless steel
• Fitment Information: Models without Sport Diff - With valves
• Material: aerospace-grade stainless steel
• Homologation: ECE / EC approved
• Manufacturer: Milltek Sport (United Kingdom)

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 VIN before ordering.

Frequently Asked Questions

• And what about the neighbors in the morning? The valves are controlled as on the factory system: closed and discreet on startup or in comfort mode, fully open in sport mode.
• Homologation: this system is ECE / EC approved, a real plus for driving with peace of mind and passing the contrôle technique.
• Installation: the system uses the original mounting points. A repair shop typically fits it in one to two hours.

Why Choose Milltek Sport?

Feedback from owners most often points to fit quality and a deep tone that is present but never harsh. That is the Milltek Sport signature, from a British manufacturer specializing in stainless steel exhausts.

Further Reading

• Exhaust Systems with Valves: How They Work and Whether to Keep Them
• Exhaust Systems and the Contrôle Technique in France