Turbo XS RBV (Recirculating Bypass Valve). The design has also been altered to make this BOV connect directly to the WRX or STI's stock recirculation fitting allowing you to get the performance from this BOV without being forced to vent to atmosphere, which can cause backfiring on MAP based cars like the WRX & STI. All in all this Turbo XS RBV BOV kit for the WRX and STI is the best we have seen from Turbo XS as far as Blow off valves is concerned and it may be the best BOV on the market today for your WRX or STI. Notes : Does not work with Turbo XS vehicle-specific adapter flanges. The item "Turbo XS RBV Recirculating Blow Off Valve Kit for 2002-2007 Subaru Impreza WRX" is in sale since Sunday, December 23, 2012.This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Turbos, Nitrous, Superchargers\Turbo Chargers & Parts". The seller is "boneheadperformance" and is located in Warminster, Pennsylvania. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Dominican republic, Panama, Viet nam.