HP EFI ECU & Harness Kits - 550-603N distributors-and-parts Uses the factory hanger locations

Uses the factory hanger locations for easy installation

GMC Sierra 2500

Year Make Model Submodel Engine Size 1980 Cadillac Seville     1973 Pontiac GTO     1974 GMC P15/P1500 Van     1974 GMC P25/P2500 Van     1974 GMC P35/P3500 Van     1973 Buick Centurion     1973 Pontiac LeMans Safari 250/4

The American Thunder® exhaust systems are the perfect choice for the person wanting a deep powerful tone outside

it delivers a moderate exterior tone and a mild interior tone and is suited to the enthusiast who wants a subtle but distinctive performance exhaust note

HP EFI ECU & Harness Kits - 550-603N distributors-and-parts Uses the factory hanger locationsOverview: Looking for a plug and play kit for your GM LS engine? The HP ECU allows you to accurately control the fuel and ignition of your engine plus much more. Got a stock LS engine? Simply download a base map and you're on your way. Got a turbocharged, nitrous fed LS engine on water meth? This HP EFI kit can control that too! Features: Simple Installation Plug and Play control of GM LS2 LS3 LS7 engines. Just plug the harness into your factory