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 plug-and-play EFI system designed for GM LS 24x crank reluctor engines, delivering up to 650 HP naturally aspirated or 600 HP with forced induction. It replaces a 4150 carburetor flange, offering integrated fuel, spark, and transmission control for a clean, stealthy installation optimized for performance enthusiasts building powerful American V8s.

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 display—no laptop needed
• Self-learning fuel maps with integrated ignition timing control for improved idle stability and WOT power
• 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
• OEM style TPS/IAC sensors included; Bosch LSU 4.9 wideband O2 sensor for real-time fuel tuning
• Supports boost control, dry nitrous, knock retard, and datalogging
• Machined air entry fits most stock air cleaners with locator provisions

Fitment

• GM LS engines with 24x or 58x crank reluctor
• 4150 squarebore flange carburetor replacement
• Universal fit for many factory intake manifolds

Note: Requires external fuel pressure regulator set to 58.5 PSI (Holley P/N 12-886 or equivalent). Verify compatibility with your transmission and engine setup before ordering.