Under normal driving when engine vaum is high there is no boost. The by pass valve is open . Under load when the engine vacum drops the bypass valve closes and voila you have boost. Normal driving you don't notice anything at all
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ROUSHCHARGER S/C,ROUSH SUSPENSION,ROUSH 14" BRAKES, ROUSH BILLET LCA, ROUSH 18"WHEELS,
ROUSH REAR LOUVERS, BMR ADJ.PANHARD,
ROUSH STRUTBRACE, ROUSH ENGINE & INTERIOR BILLET,NEXUS WIDE BAND A/F, NEXUS BOOST/VAC,
SOS DUAL PILLAR POD
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