HOLLEY EFI Terminator X Max Stealth 4150 - GM LS Engines - 58X

The HOLLEY EFI Terminator X Max Stealth 4150 - GM LS Engines - 58X is a high-performance EFI system designed for GM LS engines with 58X crank triggers. It supports up to 650 HP naturally aspirated and 600 HP forced induction applications, delivering superior idle stability, drivability, and power with integrated ignition timing control and self-learning fuel maps.

Key Features

Four 100 lb/hr fuel injectors supporting up to 650 HP
Plug and play transmission control for GM 4L60 and 4L80 transmissions
Internal 1 bar MAP sensor built into the ECU
Stealth wiring exits below fuel injector bowls for clean installation
Machined air entry fits most stock-style air cleaners with locator provisions
Requires external fuel pressure regulator set to 58.5 PSI (e.g., Holley 12-886)
Integrated ignition timing control with factory LS coil harness compatibility—no external modules needed
High-resolution full-color touchscreen for setup, tuning, and gauges
Simple calibration wizard with self-tuning capability—no laptop required
Four inputs and four outputs for sensors, accessories, and control functions
Includes Genuine Bosch LSU 4.9 wideband oxygen sensor for real-time fuel map learning
OEM-style TPS and IAC for reliable long-term use
Available in shiny, black, and gold finishes
Compatible with Holley EFI digital dashboards, gauges, and fuel system accessories

Fitment

GM LS engines with 58X crank trigger
Compatible with GM 4L60 and 4L80 transmissions for plug and play control

Note: An external fuel pressure regulator is required and must be set to 58.5 PSI. Verify compatibility with your specific engine and transmission before ordering. Installation requires basic EFI knowledge for optimal setup.