Our Maxflow® Race Bypass Valve flows 320 CFM@8 PSIG and features 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 four to five inches of vacuum and Blow-off valve is preset to open at 10 to 11 inches of vacuum. Installation gasket is included. The outlet mates to a 1.75" hose.