Holley EFI Terminator X Stealth GM LS 4150 – Black

Holley EFI Terminator X Stealth GM LS 4150 – Black

The Holley EFI Terminator X Stealth GM LS 4150 – Black is a high-performance EFI system designed for GM LS engines with a 4150 squarebore flange. It supports up to 650 HP naturally aspirated and 600 HP forced induction, delivering precise fuel and ignition control with a fully self-tuning ECU. This stealthy system integrates a built-in 1bar MAP sensor and features a compact design that fits under most stock air cleaners, making it ideal for enthusiasts seeking reliable power and drivability improvements.

Key Features

• Supports up to 650 HP with four 100 lb/hr fuel injectors at 58.5 PSI
• Integrated ignition timing control with plug-and-play LS coil harness compatibility
• Self-tuning ECU with high-resolution full-color touchscreen—no laptop required
• Built-in 1bar MAP sensor and transmission kickdown provisions for GM and Ford automatics
• Includes genuine Bosch LSU 4.9 wideband oxygen sensor for real-time fuel map learning
• Compact, stealthy design with wiring exiting below injector bowls and air cleaner locator provisions
• Supports boost control, nitrous control, multi-stage and progressive nitrous management
• CAN-BUS and datalogging support included

Fitment

• GM LS engines with 4150 squarebore throttle body flange
• Compatible with GM LS 58x crank reluctor and coil-near-plug ignition setups

Note: External fuel pressure regulator (set to 58.5 PSI) required but not included. Verify compatibility with your transmission and engine setup before ordering. Installation requires basic EFI tuning knowledge for optimal performance.