Perrin Red Recirculation BOV Blow Off Valve kit for Subaru 02-07 WRX 04-18 STI

Direct fit & Pre-set adjustment

Included with every Perrin Blow Off Valve are the necessary components to make this a direct bolt-on for your WRX/STI. Each blow off valve is pre-set out of the box to work perfectly with every application, so no adjustment required. 

Construction

The PERRIN blow off valve cap, piston & flange are all CNC machined from 6061 Billet Aluminum. The body is CNC machined from a single block of aluminum. No additional bolt on pieces means we eliminate potential leaks.
 
Adjustable Relief Pressure

The PERRIN BOV features an adjustable cap which allows you to tailor when your BOV releases. Set it up loose for a smoother release of boost at light loads and RPM. Or crank down the cap to release boost only at higher boost loads and RPMs. This feature is independent of relief volume.
 
Adjustable Relief Volume

Our unique design allows you to adjust the volume of air released when blowing off. This adjustment is independent of the resistance to blowing off. Venting too little can damage the turbo, venting too much air can will make the throttle less responsive.
 
Maintenance

The PERRIN blow off valve requires very little maintenance but when needed, it's very easy and quick to disassemble the blow of valve with no special tools required.
 
High Flow

With large 1.225" 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 over-sized blow off valves, these inlet and outlet sizes were chosen to ensure the prefect balance of flow and to maintain boost in your system, without ruining response by dumping too much boost.