WHIPPLE: Bypass assembly 1.50" 180-deg right (single port) 1.7G All Silver Bullet Throttle Body

All Silver Bullet Throttle Body Spacers are precision machined from 6061-T6 billet aluminum for light weight

2004-2009 Toyota 4Runner V6 4

The housing features auxiliary inlet duct for better airflow

Diameter:  11/32" - 16

4L Gas 1991-1997 GMC Van P Ser V8 7

WHIPPLE: Bypass assembly 1.50" 180-deg right (single port) 1.7G All Silver Bullet Throttle BodyWhat does a bypass valve do? The best kept secret in forced induction is the little known air bypass valve. When properly installed the bypass valve makes the supercharger efficient and reduces parasitic loss! The bypass is operated by a vacuum actuator control unit that is normally closed. When vacuum is high the actuator opens the bypass valve, equalizing the vacuum pressure throughout the system. When boost is required the vacuum is decreased and