Milltek80mm Large Bore Downpipe & Hi-Flow Sports CatFitment: Audi RS6 C8

Overview

The Milltek 80mm Cat Back Large Bore Downpipe & Hi-Flow Sports Cat is a turbo-back component engineered for the Audi RS6 C8 (4.0L bi-turbo V8), Audi RS7 C8, and Audi S8 D5 (4.0L TFSI V8). This system optimizes exhaust flow downstream of the turbos and ahead of the cat-back system, unlocking measurable power gains and refined acoustic character.

Manufactured from T304L stainless steel with mandrel-bent piping (3.15" / 80mm bore) and a high-flow sports catalytic converter (200 CPSI), the downpipe delivers direct factory fitment using OEM mounting points. The hi-flow cat maintains emissions compliance while reducing back pressure. Stage 2 ECU software is required to unlock full performance potential.

Details

Fitment Notes

• Audi RS6 C8 4.0L bi-turbo V8 (Performance Edition, 2020+)
• Audi RS7 C8 4.0L bi-turbo V8 (2019+)
• Audi S8 D5 4.0L TFSI V8 Standard Wheelbase (2020+)
• Audi S8 D5 4.0L TFSI V8 Long Wheelbase (2020+)

Requires integration with OE or Milltek cat-back exhaust system. No OEM modifications necessary.

Designed and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.

Fitment