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EFI Systems

EFI Performance Tuning 

EFI performance tuning is a game-changer for anyone looking to squeeze every last ounce of efficiency and horsepower from their engine. Scram Speed offers a wide variety of tools for dialing in the perfect tune. Whether you’re just starting out or chasing tenths at the track, our EFI performance tuning products make setup and adjustment straightforward.

Looking for simplicity? The self-tuning Holley EFI system is a favorite among our clients for its plug-and-play ease. It’s ideal for builders who want results without constant fiddling. Our team is always on hand to help you select the right components to get your setup running flawlessly. Reach out to Scram Speed today for expert support and to take your EFI performance tuning to the next level.

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  • Holley Performance Parts – EFI, Intakes, & More Holley 550-904T TERMINATOR X 24X/1X MULTEC 2 LS MPFI KIT - WITHOUT 3.5 inch handheld, black electronic control module with wiring harness for fuel injection system.

    Holley Performance Parts – EFI, Intakes, & More

    Holley 550-904T TERMINATOR X 24X/1X MULTEC 2 LS MPFI KIT - WITHOUT 3.5" HANDHELD

    Take control of your LS engine with Terminator X! Don't settle for a junkyard ECU with a cumbersome tuning interface when you can have complete control of your engine, self-learning fuel strategies and the proven, race-winning technology of Holley EFI at...

    MSRP: $1,574.95
    $1,449.95
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  • Holley Performance Parts – EFI, Intakes, & More Holley 550-904 Terminator X MPFI, 4.8-6.0 Early Truck, engine electronic fuel injection controller with display and wiring harness.

    Holley Performance Parts – EFI, Intakes, & More

    Holley 550-904 Terminator X MPFI, 4.8-6.0 Early Truck

    Take control of your LS engine with Terminator X! Don't settle for a junkyard ECU with a cumbersome tuning interface when you can have complete control of your engine, self-learning fuel strategies and the proven, race-winning technology of Holley EFI at...

    MSRP: $1,687.95
    $1,599.95
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  • Holley Performance Parts – EFI, Intakes, & More Holley 550-870 Sniper Stealth 4150 Shiny, a shiny metallic fuel injection system with a digital display.

    Holley Performance Parts – EFI, Intakes, & More

    Holley 550-870 Sniper Stealth 4150 Shiny

    The Sniper 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 Sniper Stealth 4150 ECU is capable of fuel map self-learning and...

    MSRP: $1,687.95
    $1,599.95
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  • Holley Performance Parts – EFI, Intakes, & More Holley 550-1001 TERMINATOR X STEALTH 4150, SHINY - a high-performance fuel injection system with a metallic intake, black electronic control unit, and connected wiring and sensors.

    Holley Performance Parts – EFI, Intakes, & More

    Holley 550-1001 TERMINATOR X STEALTH 4150, SHINY

    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...

    MSRP: $2,249.95
    $2,099.95
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  • Holley Performance Parts – EFI, Intakes, & More Holley 554-166 I/O Expansion Holley EFI and Terminator X, black electronic control module with connectors for automotive performance tuning.

    Holley Performance Parts – EFI, Intakes, & More

    Holley 554-166 I/O Expansion Holley EFI and Terminator X

    This adds AWESOME functionality to your Holley HP, Dominator, or Terminator X EFI system.The Holley EFI CAN Input/Output Module can be added to Holley EFI HP, Dominator, Terminator X and Terminator X Max EFI installation. This CAN module will add eight...

    MSRP: $562.95
    $519.95
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  • Holley Performance Parts – EFI, Intakes, & More Holley 554-165 I/O Expansion Holley EFI and Terminator X with harness, automotive electronic control module with wiring harness and colored sensor wires.

    Holley Performance Parts – EFI, Intakes, & More

    Holley 554-165 I/O Expansion Holley EFI and Terminator X w/ harness

    This adds AWESOME functionality to your Holley HP, Dominator, or Terminator X EFI system.The Holley EFI CAN Input/Output Module can be added to Holley EFI HP, Dominator, Terminator X and Terminator X Max EFI installation. This CAN module will add eight...

    MSRP: $562.95
    $519.95
    Add to Cart The item has been added
  • Holley Sniper EFI Throttle Bracket kit, package with metal brackets, bolts, nuts, and washers for vehicle throttle installation.

    Holley Sniper EFI Throttle Bracket kit

    (1)

    One of the things that is most difficult things about the awesome conventional Sniper systems is getting the throttle cable from your carb to work with the sniper. The conventional Sniper is a bit wider than a carb, and that can cause some issues...

    (1)

    $46.99
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  • Scram Speed Sniper and Terminator X Stealth EFI 4150 Dual Feed Fuel Line Kit, high-performance fuel injection component with dual feed fuel lines and precision fittings.

    Scram Speed

    Sniper and Terminator X Stealth EFI 4150 Dual Feed Fuel Line Kit

    (1)

    The part that Holley forgot! ALSO FITS Terminator XP Stealth Kits!The Sniper Stealth EFI is a great system. It does a great job of converting a car to fuel injection while keeping that classic carburetor look. Unfortunately, Holley ships these systems...

    (1)

    $79.99
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  • Scram Speed SNS103 LS CTS Coolant Temp Sensor 3/8 NPT - 2 Pin, automotive temperature sensor with brass body and black electrical connector for engine coolant temperature monitoring.

    Scram Speed

    SNS103 LS CTS Coolant Temp sensor 3/8 NPT - 2 pin

    This is the standard LS plug with 3/8 NPT thread. This fits the standard Holley EFI harnesses (and others), and is a popular choice when installing modern EFI on an classic engine (such as SBC, small block Chrysler and Ford).

    $19.95
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  • Holley Performance Parts – EFI, Intakes, & More Holley EFI Main Power Harness -HP and Dominator EFI, automotive wiring harness with multiple connectors and insulated cables.

    Holley Performance Parts – EFI, Intakes, & More

    Holley EFI Main Power Harness -HP and Dominator EFI

    Main Power Harness for Avenger EFI, HP EFI, & Dominator EFI This is required if buying a separate Holley EFI Dominator or HP EFI ECU.    

    MSRP: $120.95
    $110.95
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  • Holley Performance Parts – EFI, Intakes, & More HOLLEY EFI DOMINATOR ECU ONLY, black vehicle management system ECU with branding

    Holley Performance Parts – EFI, Intakes, & More

    HOLLEY EFI DOMINATOR ECU ONLY

    Dominator¨ EFI Vehicle Management Systems are intended for all engine applications, from street to unlimited highÐend racing applications. Dominator¨ systems have nearly unlimited capabilities to control any power adder, input, or output you...

    MSRP: $2,699.95
    $2,499.95
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  • Holley Performance Parts – EFI, Intakes, & More Holley HP EFI HP ECU, black engine control unit with connection ports and branding label.

    Holley Performance Parts – EFI, Intakes, & More

    Holley HP EFI HP ECU

    Looking for a plug and play alternative for your stock or built late model factory EFI engine? How about a replacement ECU for your older Holley C950? Holley has you covered. HP EFI ECU and harness kits are designed to be used with popular factory EFI...

    MSRP: $2,306.95
    $2,099.95
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