4.0T TFSI X-Crossing Downpipes

The RedStar Performance Downpipes are designed to upgrade the exhaust system of compatible Audi C7 4.0T vehicles. Engineered with an OEM-style X-crossing design and OEM-spec lower flanges, these downpipes ensure a precise fit and straightforward installation process. They are optimized to significantly improve exhaust flow, which results in noticeable gains in horsepower, quicker turbo spool-up, and a sharper throttle response. The improved exhaust flow also helps to increase the lifespan of the turbos and reduce under-hood temperatures, while adding a desirable tone to the exhaust note. Available options include OE-style heat shielding with a ceramic inner liner to significantly reduce radiant heat, or high-flow catalytic converters such as GESI GEN2 400cpsi or HJS HD 200cpsi, which are rated for high horsepower and meet stringent emissions standards (excluding California for GESI). Straight tunable O2 spacers are also available to help prevent Check Engine Light conditions when using the competition (catless) model without proper tuning. These downpipes are compatible with the 2012-2019 Audi S6/RS6 Quattro C7 C7.5 4.0T, 2012-2019 Audi S7/RS7 Quattro C7 C7.5 4.0T, and 2013-2019 Audi A8/S8 Quattro D4 D4.5 4.0T. ECU tuning is highly recommended for optimal performance and calibration, with Purisic Performance recommended for this service.