HOLLEY EFI Terminator X Max Stealth 4150 - GM LS Engines - Gold - 58x

The HOLLEY EFI Terminator X Max Stealth 4150 - GM LS Engines - Gold - 58x is a complete EFI system designed for GM LS engines, supporting up to 650 HP naturally aspirated or 600 HP forced induction. It offers a stealthy installation with all wiring exiting below the injector bowls and includes advanced self-tuning capabilities for improved drivability and horsepower.

Key Features

Supports up to 650 HP with four 100 lb/hr fuel injectors
Plug and play transmission control for GM 4L60 and 4L80 transmissions
Integrated ignition timing control with factory LS coil harness compatibility
Internal 1 bar MAP sensor built into the ECU
High resolution full-color touchscreen for setup, tuning, and gauges
Simple calibration wizard with self-learning fuel maps—no laptop required
Genuine Bosch LSU 4.9 wideband oxygen sensor included for real-time fuel tuning
Wiring exits below fuel injector bowls for a clean, stealthy look
Compatible with Holley EFI digital dash and fuel system accessories

Fitment

GM LS Engines with 58x crank trigger setup
Compatible with GM 4L60 and 4L80 automatic transmissions

Note: External fuel pressure regulator required, set to 58.5 PSI. Verify compatibility with your engine and transmission before ordering. Installation requires basic mechanical skills and tuning knowledge.