SKU: HLY550-926T
UPC: 090127074565
MPN: 550-926T
The Holley Terminator X Max MPFI with Transmission and Drive-by-Wire control (part number 550-926T) is a complete standalone engine management solution purpose-built for GM LS1 and LS6 applications. This ECU integrates fuel injection, ignition timing, and transmission control into a single platform, eliminating the need for multiple computers and simplifying wiring in street and performance builds. The Terminator X Max delivers precise engine control with advanced diagnostics and tuning capabilities that make it a industry-standard choice for LS engine swaps and modifications.
The integrated drive-by-wire system provides progressive throttle control and seamless transmission communication, allowing you to retain factory drivability while running custom fuel and ignition maps. The MPFI (multi-port fuel injection) architecture delivers consistent air-fuel ratios across load ranges, supporting both naturally aspirated and forced-induction LS1/LS6 engines. Onboard datalogging and real-time tuning adjust to accommodate cam profiles, intake manifolds, and exhaust modifications without sacrificing cold-start stability or part-throttle response.
This control module is designed for builders and enthusiasts undertaking LS engine swaps into older platforms, custom hot rods, and dedicated performance vehicles where OEM engine computers cannot be reprogrammed. The Terminator X Max reduces installation complexity by consolidating ignition, fuel, and transmission logic, making it ideal for vehicles without factory DBW infrastructure or those requiring independent tuning authority. Weighing 11.8 lbs and measuring 12.5 x 9.3 x 14.2 inches, the unit mounts cleanly in engine bays with minimal footprint.
Holley's Terminator X lineup is recognized among LS platform specialists for tuning flexibility and reliability in high-performance street and racing environments. The 550-926T configuration supports four-speed, five-speed, and six-speed automatic transmissions, making it compatible with a wide range of LS swap combinations. Advanced knock detection and cylinder-by-cylinder fuel control enable consistent performance across fuel grades and ambient conditions.
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