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558-489 Sniper EFI 1 to Sniper EFI 2 Adapter Harness
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HOLLEYPART NUMBER: 510-558-489

558-489 Sniper EFI 1 to Sniper EFI 2 Adapter Harness

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Wiring Harnesses
Sniper EFI 1 to Sniper EFI 2 Adapter Harness
  • Updates Sniper 1 to Sniper 2 in One Step
  • Plug-and-Play Upgrade to Sniper 2 Throttle Body
  • Eliminates Rewiring Existing Sniper EFI
  • Wiring Harness from Sniper 2 Kit Will Not be Used

    Holley 558-489 Sniper 1 to Sniper 2 Adapter Harness:

    • This adapter is intended to be used with the original Sniper 1 EFI wiring harness and the Sniper 2 EFI throttle body
    • Eliminates the need to rewire your existing Sniper EFI installation
    • Can be used with any Sniper 2 system that is not equipped with a power distribution module (PDM)

    Emissions Note:

    This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

    CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

    • Reliable, Powerful, and Easy-to-Install Throttle Body EFI Conversions

      The Holley Sniper 2 EFI Conversion System has 14 updated features over previous kits and is easier to install, more reliable, and modernized to deliver power, efficiency, and self-tuning! Each throttle body system features a 4-barrel 4150 flange-style base, four injectors, and a four-wire connection.


      See More

       

      Take your classic carbureted engine into the modern age with Holley Sniper 2 EFI Throttle Body Conversion Kits—designed to deliver the reliability, efficiency, and performance of electronic fuel injection without the complexity. Whether you're building a street cruiser, weekend warrior, or daily driver, the Holley Sniper 2 system makes EFI upgrades straightforward and stress-free.

      Built with modern features like integrated diagnostics, self-learning capabilities, and Bluetooth tuning, this EFI system simplifies cold starts, improves throttle response, and maximizes fuel economy. Say goodbye to vapor lock, hard starts, and altitude-related tuning headaches—Sniper 2 adapts on the fly, delivering smooth, consistent performance in any condition.

      Each Holley EFI Sniper kit includes a 4-injector throttle body that bolts directly in place of most 4-barrel carburetors, making it a perfect fit for small-block and big-block engines alike. With minimal wiring and no laptop required for setup, you’ll be up and running in no time—thanks to the user-friendly, full-color touchscreen.

      Upgrade to a Holley Sniper 2 Master Kit for everything you need in one box: the throttle body, fuel system components, sensors, and harnesses—engineered to work together for seamless installation and operation.

      Whether you're after modern drivability or a cleaner engine bay, the Sniper 2 is your go-to EFI solution. Shop Holley Sniper 2 EFI Throttle Body Conversion Kits at JEGS today and experience the power of precision fueling with a factory-fresh feel.




      The Holley Sniper 2 EFI Throttle Body Conversion Kits are engineered for enthusiasts who want to upgrade from carburetion to modern electronic fuel injection without sacrificing classic engine bay aesthetics. Designed as a direct throttle body EFI conversion, the Sniper 2 system delivers improved drivability, enhanced throttle response, and more consistent air/fuel control across a wide RPM range. Whether you’re restoring a classic muscle car or modernizing a street performance build, Holley Sniper 2 EFI Throttle Body Conversion Kits provide a streamlined path to reliable, self-learning fuel injection performance.

      Switching to an EFI conversion kit can dramatically improve cold starts, idle stability, and fuel efficiency compared to traditional carburetors. For high-torque V8 applications, maintaining precise fuel delivery under load is critical—and the Sniper 2 system is built to meet that demand.

      Performance Benefits & Key Features

      Holley Sniper 2 EFI Throttle Body Conversion Kits are designed with integrated fuel injectors, advanced ECU technology, and self-tuning capabilities that automatically adjust to your engine’s airflow and performance needs. Performance enthusiasts often prioritize horsepower support capacity, injector sizing, throttle bore dimensions, and compatibility with forced induction or naturally aspirated setups.

      The throttle body design fits standard 4-barrel intake manifolds, making installation straightforward for many small block and big block applications. Enhanced fuel atomization and precise electronic control contribute to smoother acceleration and improved torque capacity, especially in modified engines with upgraded camshafts or cylinder heads.

      These kits are ideal for street performance builds, pro-touring vehicles, daily drivers, and even light drag racing applications. The system’s self-learning feature reduces the need for extensive manual tuning, allowing builders to focus on performance rather than constant adjustments. Durable construction and high-quality internal components ensure reliable operation in demanding environments.

      Fitment, Compatibility & Applications

      Holley Sniper 2 EFI Throttle Body Conversion Kits are compatible with a wide range of GM, Ford, and Mopar V8 platforms equipped with standard 4-barrel intake manifolds. Popular applications include Chevrolet Camaro, Chevelle, Nova, Ford Mustang, Dodge Charger, and classic truck builds configured for carbureted setups.

      Because the Sniper 2 system is designed as a carburetor replacement, it integrates seamlessly into many restoration and restomod projects seeking modern EFI performance. Proper fuel system upgrades, including high-pressure fuel pumps and compatible lines, are required for optimal results.

      If you’re ready to modernize your classic engine with improved drivability and reliable fuel control, explore the Holley Sniper 2 EFI Throttle Body Conversion Kits at JEGS and experience the benefits of advanced EFI technology in your next build.

    Part TypeWiring Harness
    Product LineHolley Sniper 2 EFI Throttle Body Conversion Kits
    BrandHOLLEY
    Package Height2.95
    Package Width6.05
    Package Length10.4
    Weight0.58 PG
    Vendor Part Number558-489
    Package Qty1
    Package TypeEA
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