Adjustable Blow Off Valve kit For 2002-2006-2007 Subaru WRX and 04-18 STI Fuel Pressure Regulator Head Diameter: 13mm

Head Diameter: 13mm

Superseded Part Number: ALS621

0L 2996CC V6 DOHC TURBOCHARGED

Seat turbo seals

seat anchors and zippers for easy install / removal

Adjustable Blow Off Valve kit For 2002-2006-2007 Subaru WRX and 04-18 STI Fuel Pressure Regulator Head Diameter: 13mmThe Blow Off valve (BOV) is a pressure relief device on the intake tract to prevent the turbo's compressor from going into surge. When the throttle is closed rapidly, the airflow is quickly reduced, causing flow instability and pressure fluctuations. Surge can eventually lead to thrust bearing failure due to the high loads associated with it. Blow Off valves use a combination of manifold pressure signal and spring force to detect when the throttle is