Turbosmart Gen V RacePort BOV - Black TS-0204-1132

The RacePort is Turbosmart's vent-to-atmosphere blow-off valve, and the Gen V revision is the one that fixed the old complaints — better sealing under high boost and a smoother action off throttle. The alloy body takes a weld-on flange, so it mounts directly to your charge pipe instead of hanging off an adapter, which is why this is the one that shows up on purpose-built cars rather than bolt-on kits.

 Serviceable — everything inside is a replaceable part, not a throwaway assembly.

Atmosphere venting means this is for speed-density or MAP-based setups. If you're still running a MAF, you want a recirculating valve instead or you'll fight fueling on every shift.