Pneumatic StraightGate50 External Wastegate, Vacuum-Based Actuator, Installed 6 Hg Spring, Straight-Through Design, 50 mm Butterfly-Style Zero-Offset Valve, 383.9 cfm Flow, Single or Twin Port Boost-Based Control, V-Band Mounting, Black|Turbosmart Pneumatic StraightGate50 (Vacuum-Based) 6 in. Hg External Wastegate.