GReddy Type-R Blow-Off Valve

11501660 - Standard 11501661 - Stiff Spring GReddy Blow Off Valves are easily adjustable to eliminate compressor surge and preventing premature boost leakage, while increasing boost response between shifts.  Each valve is made of durable cast and billet aluminum frame and the valve to diaphragm ratio provides performance that cheap piston types cannot offer. The spring stiffness adjustment screw and the three different sizes give the GReddy user the option to match vehicles with mild upgrades to heavily tuned engines.  There are many factors in matching a blow-off valve to an application, valve location, turbocharger size and pressure, but as a general rule of thumb, we recommend the Type RZ for 100-400hp, Type R for 260-460hp and the Stiff Spring Type R for over 400hp applications. GReddy Blow Off Valve Type-R STD (ideal for 260-460hp range) Make: Universal Size: 47mm, Standard Spring Includes: BOV, Gasket, Nuts & Bolts, Vacuum nipple, hose Use with GReddy Blow-Off Valve flange