This blow off valve vents excess turbo 'boost' into the intake system which helps reduce turbo lag， increase throttle response， prolong the life of turbocharger， and it does not cause any errors in the vehicles ECU.Features:100% brand new.Fits for most cars with 25mm intake pipe.Comes with 14psi spring and 7psi spring.Professional installation is highly recommended.Specifications:Color: ChromeMaterial: Aluminum AlloyItem size: approx. 10.2 * 9.9 * 6.8cm / 4.0 * 3.9 * 2.7inItem weight: approx. 276g / 9.7ozPackage size: approx. 12 * 11 * 8.2cm / 4.7 * 4.3 * 3.2inPackage weight: approx. 367g / 12.9ozPackage List:1 * Blow Off Valve2 * Spring