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This small bypass valve (installed between the supercharger and the air throttle body) allows this Magnuson blower to operate efficiently, in terms of economy and parasitic power loss. A vacuum-actuator control unit operates the valve. When vacuum is high (idle or cruising) the actuator opens the bypass valve, equalizing the vacuum pressure throughout the system. When boost is needed during acceleration, the vacuum is decreased and the bypass valve instantly closes, allowing pressure to increase in the cylinders.