The Terminator X Stealth 4150 EFI system bolts on as a carburetor replacement for GM LS engines and features four 100 lb/hr fuel injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction. Built for 58x crank reluctor LS engines, the self-learning Terminator X ECU delivers plug-and-play ignition timing control with factory LS coil sub-harnesses and OEM LS coils — no external boxes or modules needed.
Key Features:
- Terminator X Stealth 4150 kit for 58x LS engines
- Supports up to 650 HP with four 100 lb/hr injectors
- Terminator X Max versions provide plug-and-play transmission control for GM 4L60/4L80
- Internal 1bar MAP sensor built into the ECU
- All wiring exits below the fuel injector bowls for a stealth installation
- Air entry machined to fit most stock-style air cleaners
- Requires an external fuel pressure regulator set to 58.5 PSI base (such as Holley 12-886)
- Plug-and-play ignition timing control with factory LS coil sub-harness and OEM LS coils — Coil Near Plug, no external modules
- High-resolution full color touchscreen handheld for setup, tuning, and gauge displays
- Simple calibration wizard builds a base map from basic engine questions — no laptop required
- 4 programmable inputs (12V, ground, 5V, frequency) for sensors, nitrous activation, or trans brake
- 4 programmable outputs (ground, PWM) for fans, boost control, nitrous control, IAC
- Includes a genuine Bosch LSU 4.9 wideband oxygen sensor for real-time fuel map learning
- OEM-style TPS/IAC for long-term reliability
- Compatible with Holley EFI digital dashes, gauges, and fuel system accessories
- Available in Shiny, Black, and Gold finishes
Specifications:
- Flange Size/Style: 4150 Squarebore
- CFM: 950
- Throttle Bore: 1.75 in.
- Injector Size: 100 lb/hr @ 58.5 PSI
- Inlet/Outlet Size: 6 AN
- Fuel Pressure: 58.5 PSI
- MAP Sensor: 1 bar (internal)
- Max Horsepower Rating: 650
- Ignition Type: GM LS, 58x crank reluctor
- Handheld Included: Yes
- Finish: Black
- Part Number: 550-1061
Requires an external fuel pressure regulator (such as Holley 12-886) set to a base pressure of 58.5 PSI.
FAQ
What crank trigger does this kit support?
It's built for GM LS engines with a 58x crank reluctor.
How much horsepower can this system support?
Up to 650 HP naturally aspirated or 600 HP on forced induction, using the included four 100 lb/hr injectors.
Does it require external ignition boxes?
No — ignition control is plug-and-play with the factory LS coil sub-harness and OEM LS coils.
Do I need an external fuel pressure regulator?
Yes, an external regulator set to 58.5 PSI base pressure is required, such as Holley part 12-886.
Does it support transmission control?
Terminator X Max versions of this kit provide plug-and-play transmission control for GM 4L60/4L80 transmissions.
What finish options are available?
Shiny, Black, and Gold.
