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Holley 550-1002 Terminator X Stealth 4150 EFI System 650 HP Black

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#4255501002

Holley 550-1002 Terminator X Stealth 4150 EFI System 650 HP Black

Name: Holley 550-1002 Terminator X Stealth 4150 EFI System 650 HP Black
Brand: Holley
SKU: 4255501002
Price: 1798.95 USD
Availability: InStock

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Product Summary

Universal Fit, Throttle Body Injection Style

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Key Specs

MFG. Part #	550-1002
Injection Style	Throttle Body
Injector Size	100 lb/hr @ 58.5 PSI
Max Horsepower Rating	650
ECM Included	Yes

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Holley 550-1002 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 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 is capable of fuel map self-learning and ignition timing control, improving idle stability, drivability, and wide-open throttle horsepower! 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 Stealth 4150 kits provide transmission control for Pre-2009 GM 4L60E/4L80E Transmissions (Part numbers 550-1011, 550-1012, 550-1013)

Features:

Bolt on 4150 Flange Carburetor Replacement
Supports up to 650HP with Four 100lb/hr Injectors
Terminator X Max Stealth 4150 kits provide transmission control for Pre-2009 GM 4L60E/4L80E Transmissions (Part numbers 550-1011, 550-1012,550-1013)
Includes high pressure fuel crossover line
All of the wiring exits below the rear fuel injector cover, for a completely stealth installation
Timed spark port for vacuum advanced distributors located under the front fuel bowl, for easy access to the distributor
Air entry is 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 Holley part # 12-886
Integrated ignition timing control improves idle stability, fuel economy, and wide open throttle performance
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
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
Black Finish

Charts

Installation Instructions (PDF)

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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.

Guides & Documents

Choosing an Electronic Fuel Injection Retrofit for Your Street Rod or Muscle Car

Fuel Injection Systems Installation Instructions (4255501002)

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.

CARB warning

Holley 550-1002 Specifications

KEY SPECS
MFG. Part #	550-1002
Brand	Holley
Injection Style	Throttle Body
Injector Size	100 lb/hr @ 58.5 PSI
Max Horsepower Rating	650
ECM Included	Yes

GENERAL
Carburetor Flange Type	4-Barrel Square Bore
User Tunable	Yes
Self Tuning	Yes
Injectors Included	Yes
Intake Manifold Included	No
Metering Style	Speed density
Throttle Body Included	Yes
Throttle Body Material	Cast Aluminum
Throttle Body Finish	Powder Coated
Throttle Body Flange Type	4-Barrel Square Bore
Venturi Quantity	4
Fuel Pump Included	No
Fuel Rails Included	No
Calibration Module Included	Yes
Wiring Harness Included	Yes
Fuel Pressure Regulator Included	No
Distributor Included	No
MAP Sensor Included	Yes
IAC Motor Included	Yes
IAT Sensor Included	Yes
TPS Sensor Included	Yes
Emission Code	5
Use with Power Adder	Yes
Throttle Body Barrels	4-Barrel
GTIN Code	090127093573
Sold in Quantity	Kit

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