Recirculating Performance 25mm Blow-Off Valve 25mm performance dump valve with a design that offers one of the best flow rates on the market. This dump valve can also be factory-fitted in many popular car models. Classic 25mm Blow-Off valve that is OEM installed, providing the longest service life among all blow-off valves in both racing and standard configurations. Now with higher flow rates than ever! The Blow-Off valve comes with two upgrade springs to reinforce the piston. Included Parts: 1 x 25mm performance Blow-Off valve (recirculating) 1 x Upgrade spring, yellow 1 x Upgrade spring, blue 1 x Cable tie 1 x Allen key 2 x 35mm hose clamps Spring Pressure Yellow - 15-23 PSI (1-1.6 bar) Blue - 23-30 PSI (1.6-2 bar) The Blow-Off valve can be used as a universal recirculating dump valve for turbocharged cars but also fits the following car models. (Adjust the desired pressure using the included springs) Audi A3 1.8T S3 1.8T (8L Chassis) A4 1.8T (B5,B6 Models) RS4 (B5) V6 A6 1.8T (B5,B6