If you are looking for the famous blow-off valve noise, this is the one for you. A vent to atmosphere blow-off valve will make more noise than one that recirculates. This blow-off valve can NOT be set up to recirculate.

The 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 vents it into the atmosphere 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.

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