Greddy RZ Blow Off Valve 2002-07 WRX / 2004-12 STI

Turbo lag is the enemy of any turbocharged vehicle. Greddy's Blow Off Valves are easily adjustable to prevent both premature boost leakage and compressor surge on your 02-07 WRX & STI. Each is made of a durable cast billet aluminum frame, and the valve to diaphragm ratio provides performance that cheap piston types can not offer. The spring stiffness adjustment screw and the two different sizes give the Greddy user the ability to match any vehicle setup from stock to heavily tuned. The Type RZ BOV is a 40 mm valve and recommended for applications up to 400 horsepower. This valve can be set up to be VTA or fully recirculating on any 02-07 WRX or STI. This is not a universal valve, it includes all flanges, piping and hardware for a complete installation on your Subaru.