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 your carburetor with a clean, stealthy setup. It fits GM LS 24x or 58x engines and supports up to 650 HP naturally aspirated or 600 HP forced induction, delivering precise fuel and ignition control for improved idle, drivability, and power.

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 easy setup, tuning, and monitoring without a laptop
• Self-learning fuel maps and integrated ignition timing control for optimized performance
• Plug and play transmission control for GM 4L60, 4L80, TH350/400, and 200R4/700R4 transmissions
• Stealth wiring exits below rear fuel injector cover for a clean installation
• Bolt-on 4150 flange fits many factory intake manifolds with air cleaner locator provisions
• Supports boost control, dry and progressive nitrous control, and knock retard
• Includes Bosch LSU 4.9 wideband O2 sensor and internal 1 Bar MAP sensor

Fitment

• GM LS engines with 24x or 58x crank reluctor wheels
• Compatible with GM 4L60E and 4L80E transmissions with plug and play control

Note: Requires external fuel pressure regulator set to 58.5 PSI (Holley P/N 12-886 or equivalent). Verify compatibility with your intake manifold and transmission before ordering. Distributor not included.