Holley EFI Map Sensor Naturally Aspirated Exhaust Valve One-piece versions mount using the

One-piece versions mount using the lower front mounting holes

1996-2000 GMC C3500HD

With over a quarter century in the performance industry

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Holley EFI Map Sensor Naturally Aspirated Exhaust Valve One-piece versions mount using theHolley is quickly becoming The New Standard In EFI! Holley's HP ECU is standard equipment on the 2013 2014 Chevrolet COPO Camaro and Holley's EFI throttle body powers every NASCAR Cup Series team. Top racers are making the switch to Holley EFI every day. Racers like Tom Bailey who set three new records and took the overall event win on the 2013 Hot Rod Magazine Drag Week and John Scali who used it to win the 2013 JEGS All Star race. But that's not