Holley EFI Terminator X Gen III HEMI EFI Kit: Chrysler 300 / Dodge Ram 1500 (03-15)

Holley EFI Terminator X Gen III HEMI EFI Kit

2003–2013+ Chrysler 5.7L / 6.1L / 6.4L Non-VVT HEMI Engines

550-1225

Overview:

The Holley EFI Terminator X Gen III HEMI EFI Kit 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 non-VVT engines, this kit delivers precise fuel and ignition control to optimize performance, drivability, and tuning flexibility. Whether you're upgrading a street machine, building a weekend racer, or assembling a budget-friendly project, the Terminator X offers advanced features and user-friendly operation to get you on the road or track quickly.

Equipped with real-time fuel learning and high impedance injector drivers, this EFI kit simplifies tuning and ensures smooth engine operation. The included 3.5" LCD touchscreen handheld controller provides an intuitive calibration wizard, gauge displays, and data logging, making it accessible for both novice and experienced tuners. Holley EFI’s industry-leading software and support further enhance the tuning experience, allowing full laptop connectivity for advanced adjustments.

Key Features:

The Terminator X Gen III HEMI EFI Kit combines cutting-edge technology with practical features tailored for Chrysler HEMI engines:

• Plug-and-play engine control for 2003–2013+ Chrysler Gen III HEMI 5.7L, 6.1L, and 6.4L non-VVT engines
• Compatible with Holley EFI accessories including gauges, shift lights, and digital/pro dashes (Holley P/N 553-106, 553-111, 553-112)
• Includes EV1 or EV6 injector harness based on injector configuration
• High impedance injector drivers support Holley EFI and most stock injectors (does not support low impedance injectors)
• Integrated Bosch LSU 4.9 wideband O2 sensors for accurate air/fuel ratio monitoring and tuning
• Built-in 1 bar MAP sensor with external MAP sensor option for boosted applications
• Four programmable inputs and outputs for electric fans, boost control solenoids, nitrous activation, and more
• Advanced boost control features including boost vs. time, gear, RPM, speed, and safety limits
• Comprehensive nitrous control with wet/dry, progressive/non-progressive modes, and closed-loop AFR targeting
• Multiple advanced tables for flexible tuning configurations, including 1D and 2D maps
• On-board diagnostic LEDs for quick status checks of ECU power, engine run, TPS calibration, and cam signals
• Compact ECU design measuring 7.45” x 4.1” x 1.66” for versatile mounting options
• Free Holley EFI tuning software with full laptop compatibility for detailed tuning and data logging

Construction & Design:

The Terminator X ECU is engineered with a compact, rugged enclosure designed to withstand the demanding automotive environment. Its small footprint allows for flexible installation locations within the engine bay or interior compartments. The kit includes high-quality wiring harnesses and vacuum adapters (1/8”, 1/4”, and 3/16”) to ensure seamless integration with your engine’s existing components. Holley’s precision manufacturing and robust electronics deliver reliable performance and long-term durability, making it a trusted choice for enthusiasts and professional builders alike.

Installation & Fitment:

This EFI kit is designed for straightforward installation on Chrysler Gen III HEMI engines without variable valve timing (VVT) from 2003 to 2013 and later. The plug-and-play harnesses and included injector connectors simplify wiring, reducing installation time and complexity. The ECU’s compact size allows for mounting in tight spaces, but it is important to orient the diagnostic LEDs facing upward for proper operation. The included handheld touchscreen controller and calibration wizard guide users through initial setup and tuning, minimizing the need for specialized tools or external support.

What's Included:

• Terminator X ECU for Gen III HEMI engines
• 3.5” LCD touchscreen handheld controller with calibration wizard
• EV1 or EV6 injector harness (based on injector type)
• Bosch LSU 4.9 wideband O2 sensors
• Built-in 1 bar MAP sensor and terminated connector for external MAP sensor
• Vacuum hose adapters (1/8”, 1/4”, 3/16”)
• Wiring harnesses and connectors for sensors and inputs/outputs
• Free Holley EFI tuning software with laptop compatibility

Ideal For:

The Holley EFI Terminator X Gen III HEMI EFI Kit is ideal for enthusiasts and builders seeking a reliable, feature-rich engine management system for Chrysler 5.7L, 6.1L, and 6.4L non-VVT HEMI engines. It suits a wide range of applications including street performance vehicles, track cars, muscle cars, and budget builds. Its advanced tuning capabilities and accessory compatibility also make it a solid choice for those planning to add boost, nitrous, or other performance enhancements.