Holley EFI HP EFI Kit for GM LS1/LS6 Engines (BOSCH 02 Sensor) 13199904 3 mm Bolt Pattern

3 mm Bolt Pattern

Ford Performance Hood Lift Kit

1971-1973 Buick Electra

less heat and extended life

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Holley EFI HP EFI Kit for GM LS1/LS6 Engines (BOSCH 02 Sensor) 13199904 3 mm Bolt PatternHP 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.