Holley EFI Terminator X Max Stealth 4150 – GM LS Engines

Holley EFI Terminator X Max Stealth 4150 – GM LS Engines

The Holley EFI Terminator X Max Stealth 4150 – GM LS Engines is a universal EFI system designed to replace carburetors on GM LS 24x crank reluctor engines. It supports up to 650 HP naturally aspirated or 600 HP forced induction, delivering precise fuel and ignition control with integrated transmission management for GM 4L60E/4L80E transmissions. This system offers a clean, stealthy installation with all wiring exiting below the rear fuel injector cover and fits many stock air cleaners.

Key Features

• Includes (4) 100 lb/hr fuel injectors rated for up to 650 HP NA or 600 HP forced induction
• 3.5” handheld touchscreen for easy setup, tuning, and gauge display with no laptop needed
• Self-learning fuel maps and integrated ignition timing control for improved idle, drivability, and WOT performance
• Plug and play transmission control for GM 4L60/4L80 transmissions with kickdown provisions
• Machined air entry fits most stock air cleaners with locator provisions
• Supports boost control, knock retard, dry nitrous, multi-stage and progressive nitrous control
• Bosch LSU 4.9 wideband O2 sensor included for real-time fuel map learning
• All wiring exits below rear injector cover for stealth installation

Fitment

• GM LS engines with 24x crank reluctor
• Fits carburetor flange size 4150 squarebore intake manifolds
• Compatible with GM 4L60E and 4L80E transmissions for integrated control

Note: Requires external fuel pressure regulator set to 58.5 PSI (Holley P/N 12-886 or equivalent). Verify fitment and compatibility before ordering. Distributor and mounting hardware not included.