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Our MaxflowÂ® Race Bypass Valves flow 320 CFM @ 8 PSIG and feature a compact design that is ideal for sport compacts and other applications with tight engine compartments. These units will retrofit to standard HKS/Greddy style mounting pads and out performs anything its size. Bypass valve is preset to open at three to four inches of vacuum and Blow-off valve is preset to open at 10 to 11 inches of vacuum. Installation gasket is included. The inlet hole measures 1.51"/38.51mm, and the outlet mates to a 1.75" hose.