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Home » Subaru WRX/STI » Blow Off Valves   Blitz Dual Drive Blow Off Valve for WRX/STI The Blowoff Valve DD ( Dual Drive) design flows 20% more than our previous model while emitting a uniquely aggressive sound. For maximum response the DD uses the small port for low boost and a a larger port for high boost. The user has the option of using a mini SUS power air cleaner or the open atmosphere design. The blow off valve is constructed of heavy-duty die-cast aluminum and is capable of handling up to 18psi(1.2bar). An optional hard spring is available for higher boost applications (race use or boost over 18psi/1.2bar).   Vehicle Options Please Select...2002-2005 WRX 2004-2005 STI   Price: $254.00   « Previous | Next »