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Features and Specifications
Perrin Red Recirculating Blow Off Valve WRX 02-07 / STI 04-15 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 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. The PERRIN Blow Off Valve cap features adjustable spring tension, which allows

for an adjustment when the blow off valve vents. A looser setting will make it act smooth

and more like stock. Setting it harder will cause it to vent later and with significantly

increased boost levels. This adjustment is important in maintaining air within the boost

system without reducing turbo response. The unique design allows you to control the

volume of air released when the blow off valve vents. Adjusting the volume of air helps

maintain the perfect amount of boost in your system during shifts without causing

compressor surge. Venting too little can damage the turbo, venting too much air can

make the throttle less responsive. This adjustment is independent of the relief pressure

allowing for a totally customizable blow off valve. 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. The PERRIN Blow Off Valve cap, piston & flange are all

CNC machined from 6061 Billet Aluminum. The PERRIN Blow Off Valve body is CNC

machined from a single block of aluminum. This makes for a clean look that reduces

potential failure points and leaks without additional parts.
  • 2002 Subaru Impreza WRX
  • 2003 Subaru Impreza WRX

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