Blitz Dump Valve Kit - Blow Off Valve - 70487 - Impreza GH8, Forester SH9, Legacy BP5-BL5Blitz Venturi Drive Super Sound Blow Off Valve Release Type Deep Metal Coating The all new ribbed main body dissipates heat more effectively and the venturi shaped funnel creates a sharp dynamic sound. Venturi Drive dump valves also feature "Dual Drive" for maximum response, a small port for low boost and a larger port for high boost. The main purpose of the dump valves is to improve the response of the turbo by quickly releasing the boost pressure
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