Skip to Product Info
    • 550-1006_x-collage.jpg
    • 550-1006_01.jpg
    • 550-1006_02.jpg
    • 550-1006_03.jpg
    • 550-1006_04.jpg
    • 550-1006_05.jpg
    • 550-1006_06.jpg
    • 550-1006_07.jpg
    • 550-1006_08.jpg
    • 550-1006_09.jpg
    • 550-1006_10.jpg
    • 550-1006_11.jpg
    Sale!New!

    Holley EFI Holley EFI Terminator X Stealth GM LS 4150 - Gold 550-1022

    Vendor: Holley EFI
    Part Number: 550-1022
    Save $300
    Sale Price $2,399.95 Regular Price $2,699.95

    Available to order. In-stock orders typically ship in 1 to 2 business days.

    Not sure it fits your vehicle?
    Email sales@berryperformancesales.com with your year, make, model and engine, and we'll help you check fitment before you order.
    Fast Fulfillment: In-stock orders typically ship within 1 to 2 business days.
    Free Shipping on Orders Over $99 | Excludes freight shipments
    International Shipping Available: email sales@berryperformancesales.com for a quote.
    Payment & Security

    Secure, encrypted checkout. Card details go straight to the payment processor and are never stored by us.

    • Amazon
    • Amazon
    • American Express
    • Apple Pay
    • Diners Club
    • Discover
    • Google Pay
    • Mastercard
    • PayPal
    • Shop Pay
    • Venmo
    • Visa
    Share to:
    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.


    Holley EFI Holley EFI Terminator X Stealth GM LS 4150 - Gold 550-1022


    Specifications:

    10429 Yes
    10431 Yes
    Brand Holley EFI
    10423 Yes
    Category Air and Fuel Delivery
    CFM 950
    10438 Yes
    Color Gold
    Crank Reluctor 24x
    10430 Yes
    10437 No
    10442 Yes
    10418 No
    10428 Yes
    Emission Code 3
    Finish Gold
    Flange Size 4150
    Flange Style Squarebore
    10433 Yes
    7246 No
    10417 No
    906 Yes
    Fuel Pressure 58.5 PSI
    10425 No
    8922 No
    3390 Performance
    Handheld Included Yes
    909 No
    10422 Yes
    Ignition Type GM LS 24x
    10432 No
    Injector Size 100 lb/hr @ 58.5 PSI
    Inlet / Outlet Size 6AN
    9780 No
    10427 Yes
    MAP Sensor 1bar
    Max Horsepower Rating 650
    30 No
    10420 Yes
    part type Fuel Injection System
    Product Type EFI System
    10421 Yes
    10434 Yes
    Sub Category Fuel Injection System and Related Components
    Terminator LS Options Fuel, Spark
    Throttle Bore 1.75 in.
    918 Yes
    Transmission N/A
    10435 Yes
    Warning California Proposition 65
    10429 Yes
    10431 Yes
    Brand Holley EFI
    10423 Yes
    Category Air and Fuel Delivery
    CFM 950
    10438 Yes
    Color Gold
    Crank Reluctor 24x
    10430 Yes
    10437 No
    10442 Yes
    10418 No
    10428 Yes
    Emission Code 3
    Finish Gold
    Flange Size 4150
    Flange Style Squarebore
    10433 Yes
    7246 No
    10417 No
    906 Yes
    Fuel Pressure 58.5 PSI
    10425 No
    8922 No
    3390 Performance
    Handheld Included Yes
    909 No
    10422 Yes
    Ignition Type GM LS 24x
    10432 No
    Injector Size 100 lb/hr @ 58.5 PSI
    Inlet / Outlet Size 6AN
    9780 No
    10427 Yes
    MAP Sensor 1bar
    Max Horsepower Rating 650
    30 No
    10420 Yes
    part type Fuel Injection System
    Product Type EFI System
    10421 Yes
    10434 Yes
    Sub Category Fuel Injection System and Related Components
    Terminator LS Options Fuel, Spark
    Throttle Bore 1.75 in.
    918 Yes
    Transmission N/A
    10435 Yes
    Warning California Proposition 65
    Description_INV TERMX STEALTH 4150, 4 INJ, LS 24X, GOLD
    Description_DES Holley EFI Terminator X Stealth GM LS 4150 - Gold
    Description_EXT 24X Crank - 4 Injectors - 650 HP
    Description_MKT 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.
    Description_FAB Terminator X Stealth 4150 Kits for either 24x or 58x LS engines
    Description_FAB Supports up to 650HP with Four 100lb./hr. Injectors
    Description_FAB Terminator X Max kits provide plug and play Transmission control for GM Transmissions
    Description_FAB Internal 1bar MAP sensor, built into the Terminator X ECU.
    Description_FAB All of the wiring exits below the fuel injector bowls, for a completely stealth installation
    Description_FAB Air entry machined to fit most stock style air cleaners with air cleaner locator provisions
    Description_FAB External fuel pressure regulator required, set to a base pressure of 58.5 PSI, such as 12-886
    Description_FAB Integrated ignition timing control â€"Plug and play with factory LS coil sub harness and OEM LS coils â€" no external boxes/modules needed to run Coil Near Plug
    Description_FAB High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays
    Description_FAB 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!
    Description_FAB Self-tuning ECU means you don’t have to be a computer/tuning wiz to have EFI!
    Description_FAB 4 Inputs â€" 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)
    Description_FAB 4 Outputs â€" Ground, PWM - , for accessories such as; fans, boost control, nitrous control, IAC Kit, and More
    Description_FAB The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides real-time Fuel Map Learn!
    Description_FAB OEM Style TPS/IAC, for years of dependable service
    Description_FAB Available in 3 finishes: Shiny, Black and Gold
    Description_FAB Compatible with Holley EFI digital dashes, gauges and fuel system accessories
    Description_INV TERMX STEALTH 4150, 4 INJ, LS 24X, GOLD
    Description_DES Holley EFI Terminator X Stealth GM LS 4150 - Gold
    Description_EXT 24X Crank - 4 Injectors - 650 HP
    Description_MKT 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.
    Description_FAB Terminator X Stealth 4150 Kits for either 24x or 58x LS engines
    Description_FAB Supports up to 650HP with Four 100lb./hr. Injectors
    Description_FAB Terminator X Max kits provide plug and play Transmission control for GM Transmissions
    Description_FAB Internal 1bar MAP sensor, built into the Terminator X ECU.
    Description_FAB All of the wiring exits below the fuel injector bowls, for a completely stealth installation
    Description_FAB Air entry machined to fit most stock style air cleaners with air cleaner locator provisions
    Description_FAB External fuel pressure regulator required, set to a base pressure of 58.5 PSI, such as 12-886
    Description_FAB Integrated ignition timing control â€"Plug and play with factory LS coil sub harness and OEM LS coils â€" no external boxes/modules needed to run Coil Near Plug
    Description_FAB High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays
    Description_FAB 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!
    Description_FAB Self-tuning ECU means you don’t have to be a computer/tuning wiz to have EFI!
    Description_FAB 4 Inputs â€" 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)
    Description_FAB 4 Outputs â€" Ground, PWM - , for accessories such as; fans, boost control, nitrous control, IAC Kit, and More
    Description_FAB The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides real-time Fuel Map Learn!
    Description_FAB OEM Style TPS/IAC, for years of dependable service
    Description_FAB Available in 3 finishes: Shiny, Black and Gold
    Description_FAB Compatible with Holley EFI digital dashes, gauges and fuel system accessories


    Shipping Policy
    • Free shipping on orders over $99 (excludes freight shipments).
    • In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
    • Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
    • Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
    • No P.O. Boxes. International orders need a shipping quote, so email us first.

    Read the full Shipping Policy

    Return Policy
    • 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
    • Items must be unused, complete and in the original packaging.
    • A 20% restocking fee applies, and return shipping is paid by the buyer.
    • Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
    • Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

    Read the full Return Policy

    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

    For any questions or concerns, please contact us — we’re always happy to help.

    Recently Viewed