We offer 2 mechanical Blow Off Valve (BOV) conversions that primarily serves to stop boost leaks and control boost pressures mechanically, removing the factory ECU controlled valves entirely. 

However, we are constantly asked about the WOOSH sound. And due to that we are now offer our WOOSH kit.

This kit works on any W205 C63 with factory airboxes, or with aftermarket intakes that still utilise the  plumb back hoses.

This kit serves no performance benifit whatsover apart from eliminating a little hot air from returning through the valves into the intake again (negligible performance gain)

The WOOSH kit is all about sound.

If you wanted even more beautiful sounds, and a performance increase, we strongly suggest our SHF intakes.

If your C63 is tuned, we suggest the RPA kit also. And of course the intakes too.