Holley EFI Terminator X Max Gen III HEMI EFI Controller: 5.7L / 6.1L / 6.4L Engines (2003-2015)

Holley EFI Terminator X Max Gen III HEMI EFI Controller

2003–2013+ Chrysler 5.7L / 6.1L / 6.4L GEN III HEMI Engines

550-1422

Overview:

The Holley EFI Terminator X Max Gen III HEMI EFI Controller is a comprehensive engine management solution designed specifically for Chrysler GEN III HEMI engines produced from 2003 through 2013 and beyond. Compatible with 5.7L, 6.1L, and 6.4L engines equipped with the factory Drive-by-Wire (DBW) throttle body, this controller is tailored for non-VVT applications. Whether you’re building a street-driven muscle car, a track-ready race machine, or a boosted setup, the Terminator X Max delivers precise fuel and ignition control with advanced features that simplify tuning and maximize engine performance.

Equipped with a user-friendly 3.5-inch touchscreen handheld and backed by Holley EFI’s industry-leading software suite, this system offers both plug-and-play convenience and deep customization options. It comes preloaded with base maps for common HEMI engine configurations, enabling quick startup and fast tuning to get you on the road or track without delay.

Key Features:

The Terminator X Max EFI Controller integrates advanced technology and versatile inputs/outputs to meet the demands of modern performance builds. Key features include:

• Plug-and-play compatibility with Chrysler GEN III HEMI 5.7L, 6.1L, and 6.4L engines (2003–2013+) using factory DBW throttle bodies (non-VVT only)
• High impedance injector drivers supporting Holley EFI and most stock injectors (EV1 injector harness included)
• Integrated Bosch LSU 4.9 wideband O2 sensors for accurate air/fuel ratio monitoring and precise tuning
• Built-in 1 bar MAP sensor with option to disable for external MAP sensor use, ideal for boosted applications
• Four programmable inputs and outputs supporting electric fans, boost control solenoids, nitrous activation, and more
• Advanced boost control strategies including boost vs. time, gear, RPM, and speed, plus boost safeties
• Comprehensive nitrous control with channels for wet/dry, progressive or non-progressive operation, and closed-loop AFR targeting
• Multiple advanced fuel and ignition tables (1D and 2D) for flexible tuning configurations
• On-board diagnostic LEDs for quick status checks of ECU power, engine run, TPS calibration, cam signal, and other critical parameters
• Compact ECU design (7.45” x 4.1” x 1.66”) allowing versatile mounting options
• Includes free Holley EFI tuning software for laptop-based advanced calibration and data logging

Construction & Design:

The Terminator X Max EFI Controller features a rugged, compact ECU engineered for durability and ease of installation in a variety of engine bays. Its solid-state electronics are housed in a corrosion-resistant enclosure designed to withstand the harsh automotive environment. The included handheld touchscreen is ergonomically designed for intuitive navigation, featuring a bright 3.5-inch LCD that simplifies calibration and real-time monitoring. Holley’s engineering ensures seamless integration with factory sensors and actuators, minimizing wiring complexity and installation time.

Installation & Fitment:

This EFI controller is designed for straightforward plug-and-play installation on Chrysler GEN III HEMI engines from 2003 to 2013+ with factory Drive-by-Wire throttle bodies, excluding VVT models. The kit includes an EV1 injector harness and vacuum hose adapters in multiple sizes (1/8”, 1/4”, and 3/16”) to facilitate sensor connections. The internal MAP sensor can be disabled to accommodate external MAP sensors for boosted setups, with a terminated connector included for easy integration. The compact ECU can be mounted in virtually any convenient location, but diagnostic LEDs should face upward for proper visibility.

What's Included:

• Terminator X Max Gen III HEMI EFI Controller ECU
• 3.5” touchscreen handheld controller with calibration wizard
• EV1 injector harness
• Bosch LSU 4.9 wideband O2 sensors
• Vacuum hose adapters (1/8”, 1/4”, 3/16”)
• Terminated connector for external MAP sensor
• Free Holley EFI tuning software for laptop
• Comprehensive base maps for common HEMI engine combinations

Ideal For:

The Holley EFI Terminator X Max is ideal for enthusiasts and professional builders seeking a reliable, feature-rich EFI solution for Chrysler GEN III HEMI engines without variable valve timing. It suits a wide range of applications from naturally aspirated street cars to boosted race vehicles and nitrous-equipped setups. Its combination of plug-and-play ease and advanced tuning capabilities makes it perfect for both first-time EFI users and experienced tuners looking for precise control and expandability at a competitive price point.