GFB HYBRID TMS Dual Port 98-04 Subaru Forester XT Tank Tops 2005-2006 GMC Sierra 1500 HD

2005-2006 GMC Sierra 1500 HD Fleetside 78

1999-2006 GMC Sierra 1500 Fleetside

for very good reason

Grassroots performance began with Ford and has become a part of American culture

GFB HYBRID TMS Dual Port 98-04 Subaru Forester XT Tank Tops 2005-2006 GMC Sierra 1500 HDALL THE PERFORMANCE WITH THE NOISE! The Hybrid valve is back! In 1999, GFB's first Hybrid valve pioneered the dual port design, which was so successful the technology has since been adopted by most other brands. By "staging" the two venting outlets, at low valve lifts most of the air is recirculated. As the car is driven harder, the valve opens further and more of the atmosphere venting port is exposed for a louder sound. As a benefit, this system