Universal 50mm 35psi CNC billet V-band Blow off valve BOV The Blow-Off valve (BOV) is a pressure relief device on the intake tract to prevent the turbo’s compressor from going into surge. When the throttle is closed rapidly, the airflow is quickly reduced, causing flow instability and pressure fluctuations. Surge can eventually lead to thrust bearing failure due to the high loads associated with it. Blow-Off valves use a combination of manifold pressure signal and spring force to detect when the throttle is closed. When the throttle is closed rapidly, the BOV vents boost in the intake tract to atmosphere to relieve the pressure, helping to eliminate surge. Specifics and Benefits: High-Quality Diaphragm and Short Stroke Significantly Increase Response Dual Spring System Promoted Response and Allows for High Boost Pressures Hard-Anodized Valve for Increased Air Flow 50mm Flange Diameter; Holds Up to 35PSI Boost Pressure CNC Machined Billet Aluminum Body Powder-Coated Anodized and Polished Finish Draws In Surrounding Air and Releases Aggressive Unique Discharge Sound Built for Easy Installation; Weld-On Aluminum Flange,O-Ring and Stainless Steel V-Band Clamp Included 100% Brand New Professional Installation Is Highly Recommended No Instruction Included Package Includes: 1 X 50mm Blow Off Valuve 1 X Aluminum Flange 1 X V-Band Clamp 3 X O-Rings Mounting Hardware such as Bolts, if Any is Shown in the Picture Above