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Holley 550-1028 Terminator X Max Stealth EFI 24X LS Trans Control

Rebate

Holley 550-1028 Terminator X Max Stealth EFI 24X LS Trans Control
Holley

|

#4255501028

Holley 550-1028 Terminator X Max Stealth EFI 24X LS Trans Control

  • Terminator X Max Stealth 4150 Kits for 24x LS engines provide plug and play Transmission control for GM Transmissions
  • Supports up to 650HP with Four 100lb./hr. Injectors
  • Simple Calibration Wizard (answer a few questions about your engine and it creates the base map, then starts tuning on its own!) - NO laptop required!
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Finish:

Shiny

BlackGold

$2,536.95

/kit

Factory Shipped

$2,819.95

Save $283.00


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Product Summary

4-Barrel Square Bore Carburetor Flange Type, Polished

  • Terminator X Max Stealth 4150 Kits for 24x LS engines provide plug and play Transmission control for GM Transmissions
  • Supports up to 650HP with Four 100lb./hr. Injectors
  • Simple Calibration Wizard (answer a few questions about your engine and it creates the base map, then starts tuning on its own!) - NO laptop required!
  • Integrated ignition timing control "Plug and play with factory LS coil sub harness and OEM LS coils" no external boxes/modules needed to run Coil Near Plug
  • All of the wiring exits below the fuel injector bowls, for a completely stealth installation

Rebates Available

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Key Specs

MFG. Part #550-1028
Injection StyleThrottle Body
Injector Size100 lb/hr @ 58.5 PSI
Max Horsepower Rating650
ECM IncludedYes
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Holley 550-1028 Details

The Terminator X Stealth 4150 EFI system from Holley features 4, 100LB/HR Fuel Injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications. The Terminator X ECU features fuel maps that self-learn and integrated ignition timing control, yielding improved idle stability, drivability, and horsepower at wide-open throttle! Did we mention that the Stealth 4150 also includes transmission kick down provisions for GM TH350/400, 200R4/700R4 and Ford C4/C6 applications? Terminator X Max kits provide plug and play Transmission control for GM 4L60 and 4L80 Transmissions.

Features:

  • Terminator X Stealth 4150 Kits for either 24x or 58x LS engines
  • Supports up to 650HP with Four 100lb./hr. Injectors
  • Terminator X Max kits provide plug and play Transmission control for GM Transmissions
  • Internal 1bar MAP sensor, built into the Terminator X ECU.
  • All of the wiring exits below the fuel injector bowls, for a completely stealth installation
  • Air entry machined to fit most stock style air cleaners with air cleaner locator provisions
  • External fuel pressure regulator required, set to a base pressure of 58.5 PSI, such as 12-886
  • Integrated ignition timing control "Plug and play with factory LS coil sub harness and OEM LS coils" no external boxes/modules needed to run Coil Near Plug
  • High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays
  • Simple Calibration Wizard (answer a few questions about your engine and it creates the base map, then starts tuning on its own!) - NO laptop required!
  • Self-tuning ECU means you don’t have to be a computer/tuning wiz to have EFI!
  • 4 Inputs - 12v, Ground, 5v, and Frequency, for things such as additional pressure sensors, or activation triggers for nitrous activation, or a trans brake (Fuel and Oil Pressure Inputs are pre-terminated)
  • 4 Outputs - Ground, PWM - , for accessories such as; fans, boost control, nitrous control, IAC Kit, and More
  • The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides real-time Fuel Map Learn!
  • OEM Style TPS/IAC, for years of dependable service
  • Available in 3 finishes: Shiny, Black and Gold
  • Compatible with Holley EFI digital dashes, gauges and fuel system accessories

Charts

Rebates

Holley Fuel Up Spring Savings Event 2026

Save 10% instantly on select products across the Holley family of performance brands during the annual Holley Fuel Up Spring Savings Event 2026. Instant rebate period runs from March 30, 2026 through April 19, 2026.

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.
CA Prop 65
CARB warning

Holley 550-1028 Specifications

KEY SPECS
MFG. Part #550-1028
BrandHolley
Injection StyleThrottle Body
Injector Size100 lb/hr @ 58.5 PSI
Max Horsepower Rating650
ECM IncludedYes
GENERAL
Carburetor Flange Type4-Barrel Square Bore
User TunableYes
Self TuningYes
Injectors IncludedYes
Intake Manifold IncludedNo
Metering StyleSpeed density
EGRNo
Throttle Body IncludedYes
Throttle Body MaterialCast Aluminum
Throttle Body FinishPolished
Throttle Body Flange Type4-Barrel Square Bore
Venturi Quantity4
Fuel Pump IncludedNo
Fuel Rails IncludedNo
Calibration Module IncludedYes
Wiring Harness IncludedYes
Fuel Pressure Regulator IncludedNo
Distributor IncludedNo
MAP Sensor IncludedYes
IAC Motor IncludedYes
IAT Sensor IncludedYes
TPS Sensor IncludedYes
Emission Code3
Use with Power AdderYes
Throttle Body StyleThrottle Body Injection (TBI)
Throttle Body Barrels4-Barrel
NotesDesigned for use with 24x crank reluctor
GTIN Code090127107621
Sold in QuantityKit

Fitment

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