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Holley EFI

Holley EFI 550-1421 Terminator X Max Gen III HEMI 2003-2006 Kit with DBW Throttle Body Control

Part # 550-1421 Be the first to write a review

Compatible with 2003-2006 GEN III HEMI engines with EV6 injectors, and a Drive-By-Wire throttle body.

Holley EFI 550-1421 Terminator X Max Gen III HEMI 2003-2006 Kit with DBW Throttle Body Control

Estimated Ship Date: 06/05/2026
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Emissions

This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only Vehicles.

See Emissions Details
Introducing Terminator X and X Max Kits for Chrysler GEN III HEMI engines from 2003-2013+ such as the 5.7L, 6.1L and 6.4L engines with the factory Drive-by-Wire throttle body. (Non-VVT only)

Terminator X features real-time fuel learn, high impedance injector drivers, an integrated 1bar MAP sensor, and 4 programmable inputs and outputs. The inputs and outputs are ideal for electric fans, boost control solenoids, progressive nitrous control, and much more.

Terminator X comes fully loaded with base maps for common HEMI engine combinations to get you out of the garage and on the road/track fast. The 3.5 in. touch screen LCD handheld contains an easy to use calibration wizard as well as tuning and gauge display functions.

Also included is Holley EFI's industry-leading, easy to use software suite that allows full laptop access for advanced users. Whether you are building a budget beater or a boosted race car, Terminator X has the features and technology you need at a price that won't break the bank!

Features:

  • Plug and play Chrysler GEN III Hemi control - 2003-2006 Engines such as the 5.7L, 6.1L and 6.4L engines utilizing the factory DBW (Drive by Wire) throttle body. (Non-VVT only)
  • Plug and Play compatible with Holley EFI accessories â€" Analog gauges, shift lights, modules, and both 6.86” and 12.3” Pro Dash
  • EV6 injector harness included
  • High Impedance Injector drivers power Holley EFI and most stock injectors - Injector support chart found in instructions (will not support low impedance injectors)
  • Included Bosch LSU 4.9 wideband O2 sensors for accurate readings and precise tuning control
  • Built in 1bar MAP (manifold absolute pressure) sensor included - For Boosted applications â€" internal MAP sensor can be disabled and utilize external MAP sensor harness (kit includes a terminated connector for seamless installation)
  • Vacuum hose adapters included - (1/8”, Â1/4”, and 3/16” sizes)
  • 4 inputs â€" 12v, Ground, 5v, and frequency for items like pressure sensors, activation triggers, nitrous activation, or trans brake
  • Boost Control â€" boost vs. time, boost vs. gear, boost vs. RPM, boost vs. speed, and boost safeties
  • Nitrous Control â€" channels for wet or dry, progressive or non-progressive, rich/lean safeties, and target closed loop AFR (Air/Fuel Ratio)
  • Advanced Tables â€" (4x 1D tables, 1x 1D gear table, 4x 2D table, and 1x 2D gear tables) for nearly unlimited table configuration options
  • On-board diagnostic LEDS - ECU power, engine run, TPS calibration, cam signal, and more! Identify critical engine parameters at a glance
  • 3.5” touchscreen handheld included - Internal data-logging, custom gauge display, and calibration wizard allow quick building bases tunes for any Domestic V8 engine
  • Compact ECU (Engine Control Unit) â€" At only 7.45” x 4.1” x 1.66” the compact packaging allows mounting virtually anywhere. REMINDER: diagnostic LED’s must face up!
  • FREE EFI Tuning software â€" For compete control of your Terminator X power plant
Brand Holley EFI
Emission Code3
Product TypeEngine Management Systems
WarrantyManufacturer's Limited 90 Day (1 Year with Warranty Registration)
UPC090127088067
Manufacturer Part Number550-1421
Part Number550-1421
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This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only Vehicles.

The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

  • 1965 and older U.S. manufactured California Certified vehicles
  • 1967 and older U.S. manufactured Federally Certified vehicles
  • 1967 and older Foreign manufactured vehicle

The following vehicles are considered Racing Use Only Vehicles:

  • Racing Use Only Vehicles are vehicles that are used exclusively for competition and that are not registered and that may never be used on the street

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

The following vehicles are considered Emissions Controlled Vehicles:

  • 1966 and newer U.S. manufactured California Certified vehicles
  • 1968 and newer U.S. manufactured Federally Certified vehicles
  • 1968 and newer Foreign manufactured vehicle
Harness Instructions for 550-1421
Quick Start for 550-1421
Parts Guide for 550-1421
Manufacturer's Limited 90 Day (1 Year with Warranty Registration): See Details
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    Some parts are not legal for use in California or other states with similar regulations.