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The bypass valve needs a vacuum signal to work properly, and it gets one by splicing a brass tee fitting into the brake-booster vacuum line, which is connected to the intake manifold, downstream of the throttle body. As such, when the bypass valve senses a pressure difference between the intake manifold and the supercharger ducting, the valve opens, thereby diverting air into the area upstream of the V-2. Often, the driver of a Vortech-blown car hears a hissing of air when letting off the throttle quickly because air travels backwards out of the air filter. View Related Article
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