Perrin Black Recirculating 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 Ready to Install