Holley EFI Terminator X Max Gen III HEMI EFI Controller: Fits Chrysler GEN III HEMI (03-13+)

Holley EFI Terminator X Max Gen III HEMI EFI Controller

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

550-1424

Overview:

The Holley EFI Terminator X Max Gen III HEMI EFI Controller is a high-performance engine management system 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. It offers a comprehensive plug-and-play solution that simplifies tuning and enhances engine performance for street, track, or race use.

Ideal for enthusiasts looking to upgrade their factory engine management without breaking the bank, the Terminator X Max delivers advanced features such as real-time fuel learning, integrated sensors, and multiple programmable inputs and outputs. Whether building a naturally aspirated street machine or a boosted race car, this EFI controller provides the technology and flexibility needed to optimize power and drivability.

Key Features:

The Terminator X Max EFI Controller comes loaded with features that make it a versatile and powerful choice for GEN III HEMI owners:

• 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 precise air/fuel ratio monitoring and tuning
• Built-in 1 bar MAP sensor with the option to disable for external MAP sensor use, ideal for 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 systems, and closed-loop AFR targets
• Multiple advanced tuning tables (1D and 2D) for flexible calibration and engine management
• 3.5” touchscreen handheld with an intuitive calibration wizard, data logging, and custom gauge display
• Compact ECU design (7.45” x 4.1” x 1.66”) for versatile mounting options
• Free Holley EFI tuning software for full laptop access and advanced tuning capabilities
• On-board diagnostic LEDs for quick status checks of ECU power, engine run, TPS calibration, cam signal, and more

Construction & Design:

The Terminator X Max EFI Controller is engineered with durability and compactness in mind. Its robust enclosure protects sensitive electronics while allowing for flexible mounting in tight engine bays. The included EV1 injector harness and vacuum hose adapters (1/8”, 1/4”, and 3/16”) ensure seamless integration with factory components. Holley’s attention to detail in design guarantees reliable operation under demanding conditions, making it suitable for both street and track environments.

Installation & Fitment:

This EFI controller is designed for straightforward installation on 2003 to 2013+ Chrysler GEN III HEMI engines with factory Drive-by-Wire throttle bodies (non-VVT). The plug-and-play nature minimizes wiring complexity, and the included harnesses and adapters simplify connections. The compact ECU can be mounted in various locations, but it is important to orient the diagnostic LEDs facing upward for proper visibility. The system supports multiple Holley EFI accessories, allowing for expanded functionality as needed.

What's Included:

• Holley EFI Terminator X Max Gen III HEMI 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”, and 3/16” sizes)
• Terminated connector for external MAP sensor harness (for boosted setups)
• Free Holley EFI tuning software download

Ideal For:

The Holley EFI Terminator X Max is perfect for enthusiasts and builders who want a reliable, feature-rich EFI controller for their GEN III HEMI engines. Whether you are upgrading a factory setup, building a street performance vehicle, or constructing a boosted race car, this system offers the tuning flexibility and control necessary to maximize engine potential. Its ease of use and comprehensive feature set make it suitable for both first-time EFI users and experienced tuners alike.