Holley EFI Kit Terminator X 24X Crank 4X Cam/ EV6 Injectors For GM LS1/ LS6 Engines



  • For 24X Crank Reluctor w/EV6
  • Real-Time Fuel Map Learn
  • 3-1/2" LCD Touch Screen
  • Proudly Made in the USA!
MSRP $1,587.00
You save 10%

Holley Terminator X EFI Kit for GM LS1 and LS6 Engines with 24X Crank 4X Cam and EV6 Style Fuel Injectors.

This Holley Terminator X EFI Kit uses self-learning fuel strategies to provide you with complete control over your GM LS1 or LS6 engine. This kit is for engines with a 24x crank reluctor and EV6 injectors, and it's proudly manufactured in the USA!

Features and Benefits:
- Real-time fuel map learns and tunes base fuel table
- High impedance injector drivers safely power most LS/EFI injectors
- Utilizes Bosch LSU 4.9 wideband to relay AFR information
- Accurate readings and precise tuning control
- MAP Sensor vacuum hose adapters (1/8th – 1/4 and 3/16ths)
- Four (x4) inputs - 12V, 5V, ground, frequency - for pressure sensors and activation triggers
- Boost control solenoids for time, gear, RPM, speed, and safeties
- Nitrous control allows single-channel wet/dry, non/progressive, rich/lean safeties, target closed loop AFR
- Non-progressive nitrous control for rich/lean safeties and target closed loop AFR
- On-board diagnostics LEDs monitor ECU power, engine run, and wideband status
- Easily identify critical engine issues and monitor crank/cam signal
- 3-1/2" touchscreen handheld with calibration wizard builds base tune for any LS engine
- Internal data logging and fully customizable handheld gauge display
- Compact ECU size mounts virtually anywhere (diagnostics LEDs must face up)
- Plug-and-Play compatible with Holley analog-style gauges, shift lights, and modules
- Compatible with the soon-to-come Holley 12.3” digital dash support
- Free EFI Tuning Software for complete control of your Terminator X power plant
- Made in the USA!

This Terminator X EFI Kit (550-909) combines real-time fuel learning, high impedance injector drivers, an integrated 1bar MAP sensor, and four (4) programmable inputs and outputs for use on the road or when dominating the track. It comes with a 3-1/2 inch touchscreen LCD handheld device that allows you to calibrate and tune your system as needed. For more advanced users, this kit also comes with easy-to-use software that allows full laptop access. It is super compact with a plug-and-play installation and is great for building a boosted racing car!

Kit Includes:
- 24x LS Engine Main Harness
- EV6 Injector Harness
- Terminator X ECU
- ECU Main Power Harness 
- Bosch LSU 4.9 Wideband Oxygen Sensor 
- Input/Output Harness 
- Assorted Vacuum Adapters

Tech Tips:
- Onboard 1bar MAP sensor is perfect for N/A or nitrous engine combos. If your combination requires a 2+Bar, we recommend GM P/N: 12592525 and Holley adapter P/N: 558-416.
- Advanced Tables – 4x 1D Tables, 1x 1D per Gear Table, 4x 2D Tables, 1x 2D per Gear Table, can be used for any custom table such as Flex Fuel Sensor Offset Table, or a custom fuel or oil pressure safety.

*Designed for GM LS1/LS6 Engines with EV6 Injectors.
*For engines with 24X Crank 4X Cam.

California Residents: Proposition 65 Warning

Related Categories: Mustang Parts, Mustang Electrical & Wiring, Mustang EFI Engine & Injector Harnesses, Mustang Engine, Ford Bronco Parts

Only for use on pre-pollution controlled vehicles: This product can be used on vehicles that were manufactured before emissions control regulations were imposed. Pre-pollution vehicles are defined as:

  • 1965 and older U.S. manufactured California certified vehicles
  • 1967 and older U.S. manufactured federally certified vehicles

Installation Difficulty


Intermediate skill is required for this installation.

Vehicle Fitment

This product will fit the following Bronco years:

This product will fit the following C/K years:

  • 1988,
  • 1989,
  • 1990,
  • 1991,
  • 1992,
  • 1993,
  • 1994,
  • 1995,
  • 1996,
  • 1997,
  • 1998,

This product will fit the following C10 years:

This product will fit the following F-100 years:

  • 1948,
  • 1949,
  • 1950,
  • 1951,
  • 1952,
  • 1953,
  • 1954,
  • 1955,
  • 1956,
  • 1957,
  • 1958,
  • 1959,
  • 1960,
  • 1961,
  • 1962,
  • 1963,
  • 1964,
  • 1965,
  • 1966,
  • 1967,
  • 1968,
  • 1969,
  • 1970,
  • 1971,
  • 1972,
  • 1973,
  • 1974,
  • 1975,
  • 1976,
  • 1977,
  • 1978,
  • 1979,

This product will fit the following Mustang years:

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