Dewhel Universal 50mm V-Band Blow Off Valve Dump Valve BOV with Aluminum Flange(Black) High-Quality Diaphragm and Short Stroke Significantly Increase Response Dual Spring System Promoted Response and Allows for High Boost Pressures,The spring pressure of the product itself :20PSI/1.4BAR ,Spring pressure in package :6PSI/0.4bar CNC Machined Billet Aluminum Body Professional Installation Is Highly Recommended Universal Application, Great for All Turbo and Intercooler Upgrade