Product Description
Fitment Information:
2002-2007 Subaru WRX
2004-2021 Subaru STI
Add horsepower, quicker response, and reliability with the Perrin blow off valve. A must-have replacement for the leaky, slow responding, and plastic OEM blow off valve.
Features:
Faster Response Time, Consistent Boost, and Better Driveability
Adjustable Release Setting and Flow Control
Direct Bolt On BOV
No Tuning Required
Body Material 6061 Aluminum
Body Finish Anodize Red or Black
Easy Installation Effort
Estimated Installation Time - 30 Minutes
Installation Instructions
5 Year Manufacturer Warranty
With large inlets and outlets, the PERRIN Blow Off Valve is sized perfectly to relieve any amount of boost pressure without fear of compressor surge. Don’t be fooled by giant oversized blow off valves, these inlet and outlet sizes were chosen to ensure the perfect balance of flow and to maintain boost in your system, without ruining response by dumping too much boost.
It is vital that a blow off valve for your WRX and STI recirculates the air back to the intake track to maintain proper air-fuel ratio and driveability between shifts. While this can be set up as a vent-to-atmosphere style blow off valve, we only recommend that on cars running aftermarket Speed Density type tuning (cars without mass airflow sensor).
Usually ships same or next day. 
