Universal SQV / SSQV Style Blow Off Valve PolishedSSQV SQV Type Blow Off Valve Works with Any Turbo Application (Requires Flange Fitting Kit **Note Included**). These Blow Off Valves Are Easily Adjustable To Prevent Both Premature Boost Leakage And Compressor Surge. The Spring Stiffness Adjustment Screw And The Two Different Size Give The User The Option To Match Vehicle With Mild Upgrades To Heavily Tuned Engines. It Can Hold Up To 1200HP Or 25 PSI Of Boost Pressure. Professional Install Suggested