Designed in-house by Direnza engineers, our decat downpipes are a direct replacement for the stock downpipe. Engineered to not only improve power and torque but also throttle response on the 3.0T engine. ---Manufactured from T304 grade brushed steel ---Heat Shielded to provide extra heat resistance on intense track sessions ---Mandrel bent pipework ---Fully TIG welded with CNC machined flanges ---Suitable for track/off-road use only Compatible with: Audi S4 B9 3.0T 2017+ Models.