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Holley 558-106

Main EFI Wiring Harness Early Model HEMI (Early Crank & Cam Sensors)

Holley 558-106


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Estimated to ship directly from the manufacturer on 05/29/18
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Holley 558-106 Main EFI Wiring Harness Early Model HEMI (Early Crank & Cam Sensors) $460.95
Main EFI Wiring Harness
  • Early Model HEMI (Early Crank & Cam Sensors)
  • For use with Holley HP EFI & Dominator EFI ECU

  • Holley 558-106 Details

    Main EFI Wiring Harness

    This is the main EFI Harness that connects to all of the necessary factory sensors and related EFI sensors to run a Holley EFI system. There is an Early Gen III as well as a Late Gen III harness. The main difference between the early and late harnesses is within the connector for the crank and cam sensors. These changes were implemented across the truck and passenger car lines around 2007. There is not a firm change-over date. View the photo gallery to determine the type of crank and cam sensors you have.
    Requires the HEMI injector harness, drive-by-wire harness and coil adapter harness. The HEMI's Variable Valve Timing is not supported by the Holley EFI systems at this time. You can run an engine that is equipped with VVT, but the cam timing will revert to the mechanical default. The Holley R&D team is working on an accessory harness that will drive the VVT actuator. However, it is not available at this time. The HEMI's Multi-Displacement System (MDS) was primarily designed for fuel economy purposes and does not need to be connected when switching to a Holley EFI system. NOTE: Not legal for sale or use on pollution controlled vehicles.


    Manufacturer's Part Number:

    Install a GEN III HEMI in Your Hot Rod!

    Mopar enthusiasts are in a league of their own when it comes to brand loyalty. This is especially true to the lineage of the HEMI engine. Holley is excited to offer a complete line of direct-fit wiring harnesses for the GEN III HEMI platform to run a Holley EFI system. This is a huge benefit for Mopar fans as they will now be able to completely tune, program and control the fuel parameters and ignition aspects through the advanced capabilities of a Holley EFI system rather than the limited controls of the factory ECU. Plus, Holley EFI provides additional performance settings for boost control, nitrous configurations, data logging, water/methanol calibration & more. To make installation of a Holley EFI system as easy as possible on late model HEMIs, Holley has developed a line of harnesses that will provide a direct plug-in installation to factory sensors and injectors.

    The late model HEMI has been available since 2003 and is available in several configurations including a 5.7L, 6.1L and 6.4L. Fortunately, the electronics and location of sensors and components are very similar throughout the span of production with only a couple variables in connections. To provide the easiest installation possible, there are several Holley EFI harnesses to compensate for these connector changes. All of the changes are easy to identify visually and we have supplied images of each connector. To determine ECU - Factory HEMI applications all utilized a drive-by-wire throttle body/pedal. If you are retaining the drive-by-wire and its associated advantages, you must run a Dominator ECU. Cable throttle body applications can utilize the HP ECU. A Dominator ECU may be required if the input and outputs used exceed those available on the HP ECU.

  • Take control of your late model HEMI with Holley EFI by controlling fuel and spark (Great for power upgrades and engine swaps)
  • Capable of tuning with power adders such as nitrous, superchargers or turbos and compatible with methanol and water injection
  • Harnesses are available to connect to a late model HEMI engine for the most advanced fuel and timing controls available
  • Each Harness is designed in fit and function specifically for the Gen III HEMI engine platform
  • All wiring is TXL grade copper wiring with minimal weight, high temp sleeve in a smaller diameter
  • Factory style terminations provide a strong, secure connection
  • Connectors are OEM grade for a correct, positive fit
  • Each harness is routed through a split-loom braid for protection and great looks

  • Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations