HKS SSQV4 Blow Off Valve Subaru WRX 2002-2007 / STI 2004-2007 | 71008-AF006 STI_2015-2021 Contains additional internal ribs to

Contains additional internal ribs to improve the oil flow to the strainer

AEM's progressively controlled high-pressure pump draws water (or up to a 50% alcohol mixture) from the one gallon tank with integral fluid level sensor to provide boost-dependent variable flow

Your water is fed into the intake system via interchangeable nozzles for additional flow control

You'll lose some rumble

HKS SSQV4 Blow Off Valve Subaru WRX 2002-2007 / STI 2004-2007 | 71008-AF006 STI_2015-2021 Contains additional internal ribs toFitment Information: 2002 2007 Subaru WRX 2004 2007 Subaru STI 2004 2007 Subaru Forester XT Features: Triple Fin design produces "Super Sound" Silver Finish High Quality Aluminum Die Cast Body Pull type sequential valve structure Stable operating ranges from low to high boost pressures Quickly relieves excess boost The HKS Super Sequential Blow Off Valve 4 (SSQV4) for the Subaru WRX and STI is unlike typical push type blow off valves, the pull type