Type RS BOV Blow Off Valve+ 2.5" Aluminum Polish Adapter Flange Turbo Engine Custom (Red) 100% Brand New, Custom Turbo Turbocharge Upgrade Blow Off Valve 2.5"inch Adapter require extra Coupler for Installation. It Can Hold Up To 1200HP Or 25 PSI Of Boost Pressure.Universal Fitment, Works with Turbo Engines Only! The Spring Stiffness Adjustment Screw And The Two Different Size Give The User The Option To Match Vehicle These Blow Off Valves Are Easily Adjustable To Prevent Both Premature Boost Leakage And Compressor Surge.