Holley EFI Terminator X Max EFI System

2003–2006 Chrysler Gen III HEMI 5.7L / 6.1L / 6.4L (Non-VVT)

550-1420

Overview:

The Holley EFI Terminator X Max EFI System is a comprehensive engine management solution designed specifically for Chrysler Gen III HEMI engines from 2003 to 2006, including the 5.7L, 6.1L, and 6.4L variants equipped with the factory Drive-by-Wire (DBW) throttle body. Tailored for non-VVT applications, this system delivers precise fuel and ignition control, enabling enthusiasts and professional tuners to optimize engine performance with ease.

Whether you're upgrading a street-driven muscle car or building a high-performance track machine, the Terminator X Max offers a plug-and-play installation with advanced features such as real-time fuel learning, integrated sensors, and multiple programmable inputs and outputs. Its intuitive 3.5" touchscreen handheld controller and free Holley EFI software make tuning accessible for both beginners and experienced users.

Key Features:

The Terminator X Max EFI System combines cutting-edge technology with user-friendly design to provide a versatile and powerful tuning platform. Key features include:

• Plug-and-play compatibility with 2003–2006 Chrysler Gen III HEMI 5.7L, 6.1L, and 6.4L engines using factory Drive-by-Wire 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 the option to disable for external MAP sensor use in boosted applications
• Four programmable inputs and outputs for electric fans, boost control solenoids, nitrous activation, and more
• Advanced boost control options including boost vs. time, gear, RPM, speed, and built-in safeties
• Comprehensive nitrous control with support for wet/dry, progressive/non-progressive setups, and closed-loop AFR targeting
• Multiple advanced tuning tables (1D and 2D) for flexible fuel and ignition mapping
• 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”) for versatile mounting options
• 3.5” touchscreen handheld controller with calibration wizard, data logging, and customizable gauge displays
• Free Holley EFI software suite for full laptop tuning access and advanced calibration

Construction & Design:

The Terminator X Max EFI system is engineered with durability and precision in mind. The compact ECU housing is designed to withstand the harsh automotive environment while providing ample connectivity for sensors and accessories. The included Bosch LSU 4.9 wideband O2 sensors are industry-standard components known for their reliability and accuracy, ensuring consistent air/fuel ratio readings under all operating conditions.

Holley’s attention to detail extends to the wiring harnesses and connectors, which are designed for straightforward installation and long-term durability. The system’s software and handheld interface are developed to simplify the tuning process without sacrificing advanced functionality, making it suitable for a wide range of performance applications.

Installation & Fitment:

The Terminator X Max EFI System is a direct-fit solution for 2003–2006 Chrysler Gen III HEMI engines equipped with factory Drive-by-Wire throttle bodies, excluding VVT models. Installation is straightforward with included EV1 injector harnesses and vacuum hose adapters in multiple sizes (1/8”, 1/4”, and 3/16”). The plug-and-play design minimizes the need for custom wiring or modifications, allowing for a clean and professional setup.

For boosted applications, the internal MAP sensor can be disabled to accommodate an external MAP sensor, with a terminated connector provided for seamless integration. The compact ECU can be mounted in virtually any location, but it is important to orient the diagnostic LEDs facing upward for proper visibility.

What's Included:

• Terminator X Max ECU (Engine Control Unit)
• 3.5” touchscreen handheld controller with calibration wizard
• EV1 injector harness
• Bosch LSU 4.9 wideband O2 sensors
• Built-in 1 bar MAP sensor with external MAP sensor connector
• Vacuum hose adapters (1/8”, 1/4”, 3/16”)
• Wiring harnesses and connectors for sensors and inputs/outputs
• Free Holley EFI tuning software for laptop

Ideal For:

The Holley EFI Terminator X Max is ideal for enthusiasts and builders seeking a reliable, feature-rich EFI system for their 2003–2006 Chrysler Gen III HEMI engines without variable valve timing. It suits a wide range of builds from budget-friendly street cars to boosted race vehicles, offering advanced tuning capabilities and expandability at an accessible price point. Whether upgrading from a carburetor or replacing a factory ECU, this system provides the control and flexibility needed to maximize engine performance and drivability.

Holley EFI delivers standalone engine management and EFI systems built for everything from engine swaps to serious horsepower builds. With platforms like Sniper, Terminator X, HP, and Dominator, Holley EFI is aimed at enthusiasts who want modern tuning control, data, and drivability—whether it’s a street car, track car, or full-on race program.