GENSSI SQV BOV Blow Off Valve Silver For Turbo SSQV Turbo Pull-type (Silver) Adjustable Up to 30 Psi Boost Pressure Universal fit for all cars (comes with 2.5" Flange Adapter) The Super Sequential Blow-Off Valve (SSQV) is a dual stage pull-type relief valve; which will not leak under any level of boost; This ensures a quick valve response and complete closure during idle Push-type blow off valves require spring load settings for each vehicle specification; If the spring load setting is too soft; it may leak under high boost and may not reach the desired boost setting; If the spring load setting is too strong; it may not open at low boost; The SSQV will operate under any boost pressure setting without leaking Professional installation is highly recommended; No installation instructions