Holley EFI Kit Terminator X 58X Crank 4X Cam/ USB/ CAN Tuning Cable For GM LS2/ LS3 Engines

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  • Real-Time Fuel Map Learning
  • Precise Tuning Control
  • Plug-And-Play Installation
  • Made In The USA
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Holley Terminator X EFI Kit for GM LS2 and LS3 Engines with 58X Crank 4X Cam and USB/CAN Tuning Cable.

The Holley Terminator X EFI Kit is a comprehensive and powerful tool for managing GM LS2 and LS3 engines and provides precision control and accuracy. Equipped with high-impedance injector drivers that safely power most LS/EFI injectors, this kit employs the Bosch LSU 4.9 wideband to relay AFR information in real time while its intuitive learning fuel map fine-tunes the base fuel table. Other perks include four outputs for ground, PWM fans, boost/nitrous control, and IAC kit functions plus four inputs for 12V, 5V, ground, frequency, and pressure sensors plus activation triggers.  

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
- Four outputs for Ground, PWM, fans, boost/nitrous control, IAC kit, and more
- Four inputs for 12V, 5V, ground, frequency, pressure sensors, and activation triggers
- Boost control solenoids for time, gear, RPM, speed, and safeties
- Progressive nitrous control allows single-channel wet or dry
- Non-progressive nitrous control for rich/lean safeties and target closed loop AFR
- Onboard diagnostics LEDs monitor ECU power, engine run, and wideband status
- Easily identify critical engine issues and monitor crank/cam signal
- 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
- Includes USB/CAN tuning cable for configuring ECU/engine in real-time
- Free EFI Tuning Software for complete control of your Terminator X power plant
- Made in the USA

The boost control solenoids are adjustable for time, gear RPM, speed, and safeties while progressive nitrous control allows single-channel wet or dry operation plus rich/lean safeties as well as target closed loop AFRs through non-progressive nitrous control. Onboard diagnostic LEDs monitor ECU power, engine run, wideband status, and TPS calibration so you can identify any critical engine issues in a moment. For ease of use, this kit uses a Plug-And-Play installation and comes with all the necessary harnesses. The free EFI tuning software allows you to have complete control over your system and get the customization you want.

Kit Includes:
- 58X/4X LS engine main harness
- EV1 or EV6 injector harness
- Terminator X Max ECU
- ECU main power harness 
- Bosch LSU 4.9 wideband oxygen sensor 
- Input/output harness 
- Assorted vacuum adapters (1/8”, 1/4”, and 3/16”)

Tech Tip 1:
- Advanced Tables – 4x 1D Tables, 1x 1D per Gear Table, 4x 2D Tables, 1x 2D per Gear Table, can be used for any custom tables you can dream up, such as Flex Fuel Sensor Offset Table, or a custom fuel or oil pressure safety.

Tech Tip 2:
- The compact ECU size allows you to mount it virtually anywhere. Remember, diagnostic LEDS must face up!

Vehicle Fitment:
- Designed for GM 4.8/5.3/6.0 LS Truck and LS2/LS3 Engines
- For engines with 58X Crank 4X Cam and USB/CAN Tuning Cable

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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