Terminator X and Terminator X Max. Two powertrain management systems from Holley that offer plug and play control for most domestic V8 engines starting at just $999. Why settle for a junkyard or factory ECU with a cumbersome aftermarket tuning interface when you can get complete control of your engine, self-learning fuel strategies and the proven, race winning technology of Holley EFI for under a grand!

Holley's HP EFI is one of the most capable standalone ECUs available today. Every parameter of your engine's tune can be modified via Holley's easy-to-use EFI software. The lb/hr fueling strategy is an industry first, making changes on the fly that much easier. Those features are just the beginning of the HP ECUs capabilities though; Controlling your turbocharged or nitrous-fed setup has never been easier!

The new standard in EFI with virtually unlimited capabilities! Integrated electronic transmission control, drive by wire throttle control, dual wideband oxygen sensor capability, extensive amount of inputs and outputs for various combinations, and much more.

Holley EFI systems output a ton of data to use. Holley’s EFI gauges and displays put all of that data in front of you in real-time.

Engine-specific harnesses for many applications, including LS, Gen III HEMI, Coyote, Godzilla, and Gen V LT engines