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 high-performance EFI system designed to replace a 4150 carburetor flange on GM LS engines. It supports up to 650 HP naturally aspirated or 600 HP forced induction, offering precise fuel and ignition control with integrated transmission management for GM 4L60E and 4L80E transmissions. This system provides a clean, stealth installation with all wiring exiting below the rear fuel injector cover and features a handheld touchscreen for easy setup and tuning without a laptop.

Key Features

• (4) 100 lb./hr. fuel injectors supporting up to 650 HP naturally aspirated or 600 HP forced induction
• 3.5” LCD handheld touchscreen for setup, tuning, and gauge displays
• Self-learning fuel maps and integrated ignition timing control for improved idle and WOT performance
• Plug and play transmission control for GM 4L60E and 4L80E transmissions
• Machined air entry to fit most stock air cleaners with locator provisions
• Bosch LSU 4.9 wideband O2 sensor and internal 1 Bar MAP sensor included
• Supports boost control, dry and multi-stage nitrous control, knock retard, and datalogging
• All wiring exits below rear fuel injector cover for a stealthy installation

Fitment

• GM LS engines with 24x or 58x crank reluctor wheels
• 4150 flange carburetor replacement on many factory 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 installation. Distributor and fuel pump are not included.