Holley EFI HP EFI Kit for GM LS1/LS6 Engines (BOSCH 02 Sensor) 600080139 215 lb/in Spring Rate

215 lb/in Spring Rate

Polycarbonate

Engine Side Plate Gasket

2019 GMC Sierra 1500 Limited 78

Brackets / Cable / Hardware

Holley EFI HP EFI Kit for GM LS1/LS6 Engines (BOSCH 02 Sensor) 600080139 215 lb/in Spring RateHP EFI Kit for GM LS1 LS6 Engines (BOSCH 02 Sensor) 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! Stop reflashing your factory ECU every time you make a performance modification.