KYOSTAR Catless Downpipe for Mercedes-AMG W205 C63 C63S M177 4.0T V8 Upgrade your Mercedes-AMG W205 C63 or C63S equipped with the M177 4.0T twin-turbo V8 engine with the KYOSTAR Catless Downpipe. Designed as a performance-oriented replacement for the factory downpipe configuration, this system provides an upgraded exhaust path for compatible AMG applications. The catless downpipe design removes the catalytic converter section from the exhaust assembly, creating a more direct