High-flow, straight-through downpipe dedicated to the Audi S4 B9 3.0 TFSI.
Modifying the front part of the exhaust system significantly reduces exhaust back pressure, which translates to an increase in the car's power. The De-cat version of the downpipe removes the stock catalytic converter (a version with a 200 CPSI sports catalytic converter is also available).
The component is made of stainless steel. Designed to connect with Milltek Sport Cat-back exhaust or the stock system. When replacing the downpipe, it is recommended to modify the engine control unit (ECU) and adjust its operating parameters to accommodate the increased exhaust flow.
