Perfect for those that want that signature sound between shifts, our Maxflow Race Blow-off Valves feature a 360Ëš discharge, all Billet aluminum construction, and a large rolling diaphragm configuration with dual vent porting allows for quick valve response. These units will retrofit to standard Greddy/HKS style mounting pads, are adaptable to all types of boosted engine installations and can be mounted in any position. Race BOV is preset to open at 5-7 inches of vacuum. Same mounting flange configuration as current Vortech Race Bypass, with the same 1.51"/38.51mm inlet hole. Direct replacement on VTA (vent-to-atmosphere) applications. Available in black finish.