Turbo XS RFL Series Recirculating Bypass Valve 2002-2007 WRX / 2004-2021 STI
Specifically designed for MY 2002 - 2007 Subaru WRX and STi's will also fit the 2008-2016 STI, the WS-RBV requires no adapter kit to install. It is designed for people who want to run high boost levels, but still vent their BOV back to the air intake to maintain maximum driveability.