Street. Track. Everything between.
07 3276 7829
Your garage Find parts for your vehicle Select year, make and model to narrow your search.

Holley Terminator X Max Stealth 4150 EFI Fuel Injection Systems 550-1012 Systems, Max, EFI, Four Injector, Throttle Body, Speed Density, Aluminum, Black, Tunable, Trans Control, Kit

SKU: HLY550-1012

Fuel Injection Systems

Holley Terminator X Max Stealth 4150 EFI Fuel Injection Systems 550-1012 Systems, Max, EFI, Four Injector, Throttle Body, Speed Density, Aluminum, Black, Tunable, Trans Control, Kit

SKU: HLY550-1012

Fuel Injection Systems
A$4,974.66
IN STOCK! Est Ship 4-7 days. In stock at 2 locations (more than 10 available)

Added to cart

We accept
American Express
Mastercard
Visa
PayPal Checkout
Direct Deposit
Afterpay
Apple Pay
Google Pay
Zip Pay

Description

Fuel Injection - Terminator X MAX Stealth EFI - Control Module / Throttle Body / Touch Screen / Wiring Harness - Square Bore - Aluminum - Black Anodized - Kit


Data: v2 - Desc: v4.2 - Upd: 2026-11-08 02:15:45

Data: v4.2 - Upd: 2026-11-08 06:33:45

Features

Vehicle Compatibility and Return Conditions.

This item was designed and engineered in the USA for US domestic vehicles. OBD tools, ECUs, dongles, programmers, and tuners may have limited compatibility with vehicles outside the USA due to regional differences in emission standards and system configurations. Some features and functionality may vary depending on the vehicle and location.

Some electronic tuning devices and programmers require activation, registration, or pairing with a specific vehicle’s VIN (Vehicle Identification Number). Once activated or paired, these devices may become permanently associated with that vehicle, restricting or preventing their use on another vehicle, resticting our ability to offer returns or exchanges.

Please review the product details and images to ensure it meets your needs. For clarification or assistance, feel free to contact a StreetFX agent. Note: Returns are not accepted for special order or tuning products unless the unit is deemed faulty.

(keyword: efi)

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Specifications

Reference Information

Reference Data (Provide these details to our support team)
Brand Name/s Holley, Hilborn, Holley Efi, Retrobright, Terminator X
StreetFX SKU hly550-1012
SFX Item ID 4782934
Accounting SKU hly-550-1012
Manufacturer SKU 550-1012
Manufacturer UPC 090127093627
Alternative References 550-1012, HLY-550-1012, HOL550-1012

Fuel Injection Systems, Terminator X Max, Stealth 4150 EFI, Four Injector, Throttle Body, Speed Density, Aluminum, Black, Tunable, Trans Control, Kit

Holley Terminator X Max Stealth 4150 EFI systems feature 4 or 8, 100 lb. fuel injectors capable of supporting up to 650 hp naturally aspirated and 600 or 1250 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! The throttle body has the standard 4150 carburetor flange so it will bolt down where your square bore carburetor was. Holley Terminator X Max Stealth 4150 systems provide transmission control for later model GM 4L60E and 4L80E transmissions.

Product Attributes
BrandHolley
Manufacturer's Part Number550-1012
Part TypeFuel Injection Systems
Product LineHolley Terminator X Max Stealth 4150 EFI Fuel Injection Systems
UPC090127093627
Fuel Injection StyleThrottle body
Fuel Injection System TypeSingle 4-Barrel Throttle Body (4150 Flange)
Maximum Horsepower with Gas650
Timing Control CompatibleYes
ECM IncludedYes
Self TuningYes
User TunableYes
Fuel System IncludedNone
Ignition System IncludedNone
Power Distribution IncludedNone
User Interface Included3.5 in. display
EGRNo
Transmission Controller IncludedYes
Metering StyleSpeed density
Multi-Port Fuel Rails IncludedNo
Throttle Body IncludedYes
Throttle Body Mounting Flange4-barrel square bore
Venturi Quantity4
Venturi Diameter (mm)44.45mm
Airflow Rate (cfm)950 cfm
Throttle Body MaterialCast aluminum
Throttle Body ColorBlack
Injectors IncludedYes
Injector Size (lbs/hr)100 lbs./hr.
Calibration Module IncludedYes
Wiring Harness IncludedYes
Oxygen Sensor IncludedYes
Fuel Pressure Regulator IncludedNo
MAP Sensor IncludedYes
IAT Sensor IncludedYes
TPS Sensor IncludedYes
IAC Motor IncludedYes
QuantitySold as a kit.
NotesExternal fuel pressure regulator required, set to a base pressure of 58.5 psi.

Compatibility

Loading compatibility information...