Product Name: 50mm Blow off Valve for Turbo Supercharger Turbocharger Air Intake Pipe Model NO.: GV-G BOV01 Auto parts Main Market: Middle East Component: Exhaust Pipe The Noise of Engine: Mechanical Noise Noise Source: The Noise of Engine Certification: ISO9001 Discharge Standard: Euro III Body Material: Aluminum Alloy Type: Exhaust system Blow off Valve: Name Aluminum Alloy: Material 50mm: Thickness Customized: Size Trademark: GOVI Transport Package: Inner Box_+ Carton Box Specification: 50mm Origin: Ningbo Product Description 50MM blow off valve for turbo supercharger turbocharger air intake pipeItemuniversal 50mm 0.4 bar 50mm blow off vale,blow off valve ModelBOV-50mm-Rspring pressure 0.4 bar and 1.3 barColorredMaterialAluminumSurfaceHard anodizedApplicationuniversalCustomizedYour designs are welcome ,PLEASE ConTACE USPaymentAlipay,T/T,WesternUnion, PayPal;KITS inculde1 x Blow Off Valve kits50mm aluminum billet blow off valveProduct use the same spring, the spring is a little bit more compressed in the product, which is why the spring rating is 1psi higher.The supercharger spring is specificially for supercharged cars only, if you have a quick spooling turbo it can actually push the valve open briefly before the charge gets to the manifold, dumping boost.BOV's need a 1/4" innder diameter direct source to the manifold, smaller liners can cause delays in response time.Spring pressures have nothing to do with boost.