Description
Holley EFI Terminator X Max – 2013+ Gen III HEMI
The Holley EFI Terminator X Max – 2013+ Gen III HEMI is a plug-and-play EFI system designed for 2013 and newer Chrysler Gen III HEMI engines with factory drive-by-wire throttle bodies (non-VVT). It provides precise fuel and ignition control with advanced features to help domestic V8 enthusiasts build powerful, reliable engines with ease.
Key Features
- Plug-and-play control for 2013+ Gen III HEMI 5.7L, 6.1L, and 6.4L engines with factory DBW throttle (non-VVT)
- High impedance injector drivers supporting Holley EFI and most stock injectors (Bosch EV1 style)
- Integrated 1 bar MAP sensor with external sensor support for boosted applications
- Included Bosch LSU 4.9 wideband O2 sensors for accurate air/fuel ratio tuning
- 4 programmable inputs/outputs for electric fans, boost control, nitrous, and more
- Advanced boost control with multiple trigger options and safeties
- Progressive and multi-stage nitrous control with rich/lean safeties and closed-loop AFR
- 3.5” touchscreen handheld with calibration wizard, data logging, and gauge display
- Compact ECU fits virtually anywhere; diagnostic LEDs for quick troubleshooting
- Free Holley EFI tuning software for laptop-based advanced tuning
- Supports coil-per-cylinder ignition, knock retard, EGT, CAN-BUS, and self-tuning capabilities
- Compatible with Holley EFI accessories including gauges, shift lights, and digital/pro dashes
- E85 fuel compatible for flexible performance options
Fitment
- 2013 and newer Chrysler Gen III HEMI 5.7L, 6.1L, and 6.4L engines
- Factory Drive-By-Wire throttle body equipped vehicles (non-VVT only)
Note: Verify compatibility with your vehicle’s year and engine variant before ordering. Installation requires basic EFI knowledge; tuning software and handheld device included for setup. Injector type must be high impedance (Bosch EV1). External MAP sensor recommended for boosted setups.






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