Milltek Turbo Downpipe Audi S4 B9 3.0 Turbo V6 2016-2018, S5 F5 3.0 Turbo V6/3.0 V6 T 2017-2018 - Decat Downpipe

Milltek Sport Decat Turbo Downpipe for Audi S4 B9 / S5 F5

On the Audi S4 B9 / S5 F5, the original downpipe and its catalytic converter restrict exhaust flow. This large-diameter Milltek Sport decat turbo downpipe is the foundation of a serious Stage 2 tune.

Technical specifications

• Milltek part number: SSXAU674
• Part type: Decat turbo downpipe
• Details: Decat downpipe
• Tube diameter: 63.5 mm
• Fitting information: Fits with original or Milltek exhaust system
• Material: aerospace-grade stainless steel
• Manufacturer: Milltek Sport (United Kingdom)

Compatible vehicles

• Audi S4 B9 3.0 Turbo V6 (Without sport differential, Sedan - Wagon, 2016-2018)
• Audi S4 B9 3.0 Turbo V6 (With sport differential and without rear chassis reinforcement bars, Sedan - Wagon, 2016-2018)
• Audi S5 F5 3.0 Turbo V6 (With sport differential and without rear chassis reinforcement bars, Coupe, 2017-2018)
• Audi S5 F5 3.0 V6 T (Without Sport Differential, Coupe - Convertible, 2017-2018)
• Audi S5 F5 3.0 V6 T (Without Sport Differential, Sportback, 2017-2018)
• Audi S5 F5 3.0 V6 T (With Sport Differential and without rear chassis reinforcement bars, Sportback, 2017-2018)

Not sure about compatibility with your vehicle? Contact us with your chassis number (VIN) before ordering.

Most frequently asked questions

• Is an ECU remap required? Yes. A suitable ECU map (Stage 2) is essential to make the most of the gain and avoid an engine warning light linked to the lambda sensors. It is the most frequently asked question from buyers, and the answer is always the same.
• And the technical inspection? A decat downpipe does not pass the emissions inspection. This product is intended for motorsport use only.

Why choose Milltek Sport?

Milltek Sport designs and manufactures its exhausts in England, using mandrel-bent tubing to preserve the internal diameter and a fit developed on the vehicle. The result: a clean installation with no modifications needed, and a sound tuned to remain pleasant for everyday driving.

Further reading

• Turbo downpipe: decat or high-flow catalytic converter for your Stage 2?
• Exhaust systems and the technical inspection in France

This product is intended exclusively for motorsport use on a closed circuit. Use on public roads is not permitted.