Holley EFI Kit Terminator X Max 24X Crank 1X Cam/ EV6/ TRANS/ DBW CNTRL GM LS1/LS6 Engine



  • Boost & Nitrous Control
  • Customizable 3.5" Touchscreen
  • On-Board Diagnostic Monitoring
  • Full Control of LS Engines
MSRP $2,287.00
You save 10%

Holley Terminator X Max EFI Kit for GM LS1 and LS6 Engines with 24X Crank 1X Cam, EV6 Style Fuel Injectors, Drive-By-Wire Throttle Body Control, and 4L60E/4L80E Trans Control.

Take full control of your LS Engine with the Holley Terminator X Max EFI Kit. You can truly explore the potential of your LS1/LS6 engine with the 3.5” touchscreen handheld that allows you to switch between pre-loaded base tunes or create your own for any LS engine. Additionally, the touchscreen provides internal data logging, an easy-to-use data wizard, and a fully customizable gauge display. You can monitor onboard diagnostics and spot any potential engine issues at a glance.

Features & Benefits:
- Real-Time Fuel Map Learn, Takes the Guess Work Out of Tuning your Base Fuel Table
- High Impedance Injector Drivers Safely Power Most LS & EFI Injectors
- Utilizes Bosch LSU 4.9 Wideband to Relay AFR Information to ECU
- Accurate Reading and Precise Tuning Control
- Four Inputs: 12V, Ground, 5V, and Frequency
- Four Outputs for Accessories
- Multiple Boost Control Modes: Time, Gear, RPM, Speed, and Safeties
- Progressive Nitrous Control: Single-Channel Wet or Dry
- Non-Progressive Nitrous Control: Rich/Lean Safeties and Target Closed Loop AFR
- On-Board Diagnostic LEDs Monitor ECU Power, Engine Run, Wideband Status, TPS Calibration, Crank Signal, Cam Signal
- Identify Critical Engine Issues at a Glance
- Fully Customizable 3.5” Touchscreen Handheld Provides Internal Data-Logging
- 3.5” Touchscreen Handheld Contains Calibration Wizard, Allows You to Build a Base Tune
- Compact ECU Size Allows Various Mounting Options
- Plug-and-Play Compatible Holley Analog-Style Gauges, Shift Lights, & Various Modules
- Soon-to-be-Released 12.3” Digital Dash Support
- Free EFI Tuning Software for Complete Control of Terminator X Power Plant
- Made in the USA

With the Holley Terminator X Max, you can take control of multiple boost control modes as well as progressive and non-progressive nitrous controls. Exploring and customizing your engine’s power parameters is easy with the EFI Kit software, which is loaded with various advanced tables to allow you to explore and even customize tables to your preference with laptop access. With the available plug-and-play install accessories, you can utilize Holley analog-style gauges, shift lights, and other available modules. Four Inputs and four outputs allow for fans, sensors, and more.

Kit Includes:
- 24X LS Engine Main Harness
- EV6 Injector Harness
- DBW Throttle Body Harness
- 4L60E/4L80E Transmission Control Harness
- Terminator X MAX ECU
- ECU Main Power Harness
- Bosch LSU 4.9 Wideband Oxygen Sensor
- Input/Output Harness
- Assorted Vacuum Adapters

- Designed for GM LS1/LS6 Engines with 24X Crank Reluctor with EV6 Injectors and 4L60E/4L80E Transmissions, and Drive-By-Wire Throttle Body Control.

Tech Tips:
- On-Board 1 Bar MAP Sensor is Perfect for N/A or Nitrous Engine Combos. If Your Combination Requires a 2+Bar, We Recommend GM 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 Custom Fuel/Oil Pressure Safety
- ECU Diagnostic LEDs Must Face Up
- Recommended Pedal P/N: 10379038

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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