80mm Milltek Turbo Downpipe Audi RS6 C8, RS7 C8, S8 D5 - 80 mm with Decat Pipe + GPF Bypass - for Milltek Exhaust

Decat downpipe Milltek Sport for Audi RS6 C8 / RS7 C8 / S8 D5

On the Audi RS6 C8 / RS7 C8 / S8 D5, the factory downpipe and its catalytic converter restrict exhaust flow. This large-bore Milltek Sport decat downpipe is the foundation of a serious Stage 2 build.

Technical specifications

• Milltek reference: SSXAU870
• Part type: Decat downpipe
• Details: 80 mm large-bore downpipe with decat and GPF bypass
• Tube diameter: 80 mm
• Installation information: With heat shields, Milltek line fitment, ECU remap
• Material: aerospace-grade stainless steel
• Manufacturer: Milltek Sport (UK)

Compatible vehicles

• Audi RS6 C8 4.0 V8 twin-turbo (2019-2025, with DPF)
• Audi RS7 C8 4.0 V8 twin-turbo (2019-2025, with DPF)
• Audi S8 D5 4.0 TFSI 571 hp (Sedan, 2020-2025, with DPF)

Not sure about compatibility with your vehicle? Contact us with your VIN before ordering.

Frequently asked questions

• Does it require ECU tuning? Yes. A proper Stage 2 ECU map is essential to unlock the gain and avoid a check engine light related to the lambda sensors. It is the question buyers ask most, and the answer is always the same.
• What about the technical inspection? A decat downpipe will not pass the emissions inspection. This product is intended for motorsport use only.
• Line compatibility: this downpipe is designed to connect to a Milltek line. Check for the correct version if you keep the factory exhaust.

Why choose Milltek Sport?

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

Going further

• Downpipe: decat or high-flow catalytic converter for your Stage 2?
• Exhaust system and technical inspection in France

For closed-circuit motorsport use only. Use on public roads is not permitted.