The Perrin Blow-off valve is essential to all turbocharged vehicles. The purpose of the Perrin WRX/STi Blow-off Valve is to relieve compressor surge without reducing compressor speed. It controls boost pressure that is built up by the turbo and recirculates air when the car is not under load (in between shifts).

This prevents pressure from backing up into the compressor housing, causing the turbo impeller blade to rapidly stop or even worse, to spin backwards (compressor surge or backspin). Doing so can be potentially destructive to the turbine wheel and shaft.

The Perrin blowoff valve is one of the best we have seen. The design allows it to rotate a full 360 degrees so mounting on aftermarket intercoolers or piping is not a issue. There are also o-rings between the BOV and the flange, to eliminate any possible power draining boost leaks. The spring tension and flow rates also independantly adjustable allowing you to control valve reaction time and the volume of air expelled. Spring tension is simply adjusted by turing the top cap. The Perrin blowoff valve is currenly available only in Signature Series Red.

Call Forcedfed today and order this and many more performance products for your WRX Today. 925-371-2288