HKS SQV4 super sequential blow off valve kit for the 2002-2007 WRX and STi includes everything needed to install the BOV. Comes with a vehicle-specific flange for an OEM-like fit. The SQV4 valve has one of the loudest and most recognizable sounds.
Vehicle Fitment:
2002-2007 Subaru WRX
2004-2007 Subaru STi