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    Sale!

    Holley EFI Holley EFI Terminator X Max Stealth 4150 - GM LS Engines 550-1029

    Vendor: Holley EFI
    Part Number: 550-1029
    Save $369
    Sale Price $2,949.95 Regular Price $3,318.95

    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.
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    The Terminator X Stealth 4150 system features (4) 100 lb./hr. fuel injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications. Taking the Stealth name, all of the wiring exits below the rear fuel injector cover for a clean installation. The timed spark port for vacuum advanced distributors is located under the front fuel bowl, giving greater access to the distributor. Air entry is machined to fit most stock air cleaners with air cleaner locator provisions. The ECU features fuel maps that self-learn and integrated ignition timing control, yielding improved idle stability, drivability, and horsepower at wide-open throttle (WOT). The Stealth 4150 also includes transmission kick down provisions for GM TH350/400, 200R4/700R4, and Ford C4/C6 applications for making installation more convenient. These kits provide plug and play transmission control for GM 4L60 and 4L80 transmissions.


    Holley EFI Holley EFI Terminator X Max Stealth 4150 - GM LS Engines 550-1029


    Specifications:

    10429 Yes
    10431 Yes
    Brand Holley EFI
    California Proposition 65 Yes
    10423 Yes
    Category Air and Fuel Delivery
    Category Fuel Injection - EFI
    CFM 950
    10438 Yes
    Color Black
    Crank Reluctor 24x
    10430 Yes
    10437 No
    10442 Yes
    10418 No
    10428 Yes
    Emission Code 3
    Finish Black
    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 1
    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, Transmission
    Throttle Bore 1.75 in.
    918 Yes
    Transmission 4L60E/4L80E
    3145 Universal
    10435 Yes
    Warning California Proposition 65
    10429 Yes
    10431 Yes
    Brand Holley EFI
    California Proposition 65 Yes
    10423 Yes
    Category Air and Fuel Delivery
    Category Fuel Injection - EFI
    CFM 950
    10438 Yes
    Color Black
    Crank Reluctor 24x
    10430 Yes
    10437 No
    10442 Yes
    10418 No
    10428 Yes
    Emission Code 3
    Finish Black
    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 1
    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, Transmission
    Throttle Bore 1.75 in.
    918 Yes
    Transmission 4L60E/4L80E
    3145 Universal
    10435 Yes
    Warning California Proposition 65
    Description_INV TERMXSTEALTH4150,4INJ,LS24X,BLACK,TRANS
    Description_ASC Not recommended for 4x4 applications with electronic transfer cases, not compatible with 4L6X transmissions from model year 1995 or prior due to year-by-year changes in converter lockup and downshift strategy. ECU is not recommended for marine applications, but can be used on off-road applications as long as you choose a safe location, keep it dry, protect from heat, and ensure proper wiring management. Please refer to your owners manual for further installation instructions. Requires an external fuel pressure regulator with base pressure set to 58.5 PSI (Holley P/N 12-886 or equivalent).
    Description_DES Holley EFI Terminator X Max Stealth 4150 - GM LS Engines
    Description_EXT Black - 24X Crank - Trans Control - 3.5 in. Touchscreen
    Description_MKT The Terminator X Stealth 4150 system features (4) 100 lb./hr. fuel injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications. Taking the Stealth name, all of the wiring exits below the rear fuel injector cover for a clean installation. The timed spark port for vacuum advanced distributors is located under the front fuel bowl, giving greater access to the distributor. Air entry is machined to fit most stock air cleaners with air cleaner locator provisions. The ECU features fuel maps that self-learn and integrated ignition timing control, yielding improved idle stability, drivability, and horsepower at wide-open throttle (WOT). The Stealth 4150 also includes transmission kick down provisions for GM TH350/400, 200R4/700R4, and Ford C4/C6 applications for making installation more convenient. These kits provide plug and play transmission control for GM 4L60 and 4L80 transmissions.
    Description_FAB (4) 100 lb./hr. fuel injectors supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications
    Description_FAB 3.5” LCD handheld touchscreen for setup, tuning, gauge displays, and other viewing parameters
    Description_FAB Initial handheld calibration wizard creates a base tune with no laptop needed
    Description_FAB Advanced annular discharge rings for more fuel flow and better fuel atomization, nearly elimating the fuel delay issues found on other designs
    Description_FAB Bosch LSU 4.9 Wideband Oxygen (O2) Sensor for maximum performance on real time fuel map learning
    Description_FAB OEM style TPS/IAC robust design for longevity
    Description_FAB Internal 1 Bar MAP sensor built into the ECU
    Description_FAB Bolt on 4150 flange carburetor replacement fits many factory intake manifolds
    Description_FAB Air entry is machined to fit many stock style air cleaners with air cleaner locator provisions
    Description_FAB Plug and play transmission control for GM transmissions
    Description_FAB Integrated ignition timing control improves idle stability, fuel economy, and wide open throttle (WOT)
    Description_FAB All wiring exits below the rear fuel injector cover for a stealth installation
    Description_FAB For 24x or 58x GM LS engines
    Description_FAB Four inputs include 12V, ground, 5V, and frequency, for pressure sensors, activation triggers, trans brake, etc.
    Description_FAB Fuel and Oil Pressure inputs are pre-terminated
    Description_FAB Four outputs include ground, PWN-, for fans, boost and nitrous control, IAC, etc.
    Description_FAB Requires an external fuel pressure regulator with base pressure set to 58.5 PSI (Holley P/N 12-886 or equivalent)
    Description_INV TERMXSTEALTH4150,4INJ,LS24X,BLACK,TRANS
    Description_ASC Not recommended for 4x4 applications with electronic transfer cases, not compatible with 4L6X transmissions from model year 1995 or prior due to year-by-year changes in converter lockup and downshift strategy. ECU is not recommended for marine applications, but can be used on off-road applications as long as you choose a safe location, keep it dry, protect from heat, and ensure proper wiring management. Please refer to your owners manual for further installation instructions. Requires an external fuel pressure regulator with base pressure set to 58.5 PSI (Holley P/N 12-886 or equivalent).
    Description_DES Holley EFI Terminator X Max Stealth 4150 - GM LS Engines
    Description_EXT Black - 24X Crank - Trans Control - 3.5 in. Touchscreen
    Description_MKT The Terminator X Stealth 4150 system features (4) 100 lb./hr. fuel injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications. Taking the Stealth name, all of the wiring exits below the rear fuel injector cover for a clean installation. The timed spark port for vacuum advanced distributors is located under the front fuel bowl, giving greater access to the distributor. Air entry is machined to fit most stock air cleaners with air cleaner locator provisions. The ECU features fuel maps that self-learn and integrated ignition timing control, yielding improved idle stability, drivability, and horsepower at wide-open throttle (WOT). The Stealth 4150 also includes transmission kick down provisions for GM TH350/400, 200R4/700R4, and Ford C4/C6 applications for making installation more convenient. These kits provide plug and play transmission control for GM 4L60 and 4L80 transmissions.
    Description_FAB (4) 100 lb./hr. fuel injectors supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications
    Description_FAB 3.5” LCD handheld touchscreen for setup, tuning, gauge displays, and other viewing parameters
    Description_FAB Initial handheld calibration wizard creates a base tune with no laptop needed
    Description_FAB Advanced annular discharge rings for more fuel flow and better fuel atomization, nearly elimating the fuel delay issues found on other designs
    Description_FAB Bosch LSU 4.9 Wideband Oxygen (O2) Sensor for maximum performance on real time fuel map learning
    Description_FAB OEM style TPS/IAC robust design for longevity
    Description_FAB Internal 1 Bar MAP sensor built into the ECU
    Description_FAB Bolt on 4150 flange carburetor replacement fits many factory intake manifolds
    Description_FAB Air entry is machined to fit many stock style air cleaners with air cleaner locator provisions
    Description_FAB Plug and play transmission control for GM transmissions
    Description_FAB Integrated ignition timing control improves idle stability, fuel economy, and wide open throttle (WOT)
    Description_FAB All wiring exits below the rear fuel injector cover for a stealth installation
    Description_FAB For 24x or 58x GM LS engines
    Description_FAB Four inputs include 12V, ground, 5V, and frequency, for pressure sensors, activation triggers, trans brake, etc.
    Description_FAB Fuel and Oil Pressure inputs are pre-terminated
    Description_FAB Four outputs include ground, PWN-, for fans, boost and nitrous control, IAC, etc.
    Description_FAB Requires an external fuel pressure regulator with base pressure set to 58.5 PSI (Holley P/N 12-886 or equivalent)


    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.
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    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.

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