Perrin Red Blow Off Valve Kit 2002-2007 WRX / 2004-2021 STI
The OEM BOV's tiny outlet limits the boost-venting rate and may result in leaks. The PERRIN BOV has a much larger adjustable outlet, and 1.225" inlets/outlets designed for balanced flow and boosted-system response without excessive boost loss. Adjustable spring tension in the cap tailors the valve's venting and pressure-release rate, while the unique design allows you to control the air volume. To maintain proper air-fuel ratio and driveability, the PERRIN BOV recirculates the air back into the intake track. Crafted from 6061-billet aluminum, the durable body and precise components do not require special tools or frequent maintenance. Each blow off valve comes pre-set for bolt-on convenience in WRX/STI vehicles.Features CNC Machined 6061 Aluminum Construction Red or Black Anodized Finish (Black on Cap) Recirculates Air to the Intake Track Adjustable Relief Pressure (Spring Tension) Adjustable Flow Control (Air Volume) Low Maintenance, No Special Tools Required Direct Fit, Preset and R