Universal Type S / RS Style Blow Off Valve PurpleS Type Blow Off Valve Direct Bolt On For All Turbo Application With Flange Universal Fitting Kit. This 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. NOTES: Instillation Guides not included, we