Cat-Back Milltek Audi S4 B9, S5 F5 - ECE Approved - With Primary Muffler - Quad GT90 Blued Titanium Tips

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: SSXAU647
• Part Type: Exhaust System
• Configuration: With valves
• Details: ECE approved - With primary muffler - Quad GT90 blued titanium tips
• Tube Diameter: 63.5 mm
• Outlets: 4 GT90 outlets, 90 mm
• Tip Finish: blued titanium (heat-tinted effect)
• 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?

A benchmark for European tuners, Milltek Sport develops each of its systems directly on the vehicle. Mandrel bending, careful welds and aerospace-grade stainless steel ensure a system built to last and sound right.

Further Reading

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