Chrysler has used two different coils on the HEMI engine series with 2006 being the year that the change was phased throughout the truck and car line. Fortunately the two coils are very different visually and makes for a simple review. If the coil requires spark plug wires, it is the early coil. If the coil does not require plug wires and simply has two boots that connect to the plugs in the cylinder head, it is the later coil. View the image gallery for images of both types.
- Take Command By Controlling Fuel And Spark
- Can Tune w/Power Adders Nitrous/Superchargers/Turbos
- Harness Avail. To Gen III Hemi For Advanced Fuel/Timing Control
- Harness Designed To Fit And Function w/The Gen III Hemi Engine
- TXL Copper Wiring w/Min. Weight/High Temp Sleeve In Small Dia
- Factory Style Terminations Provide A Strong Secure Connection
- Connectors Are OEM Grade For A Correct Positive Fit
- Harness Through A Split-Loom Braid For Protection/Great Looks
Holley Performance Emission Code 4: This part is legal for sale or use on Racing Use Only Vehicles. The following vehicles are considered Racing Use Only Vehicles: Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street. WARNING: It is against the law to install this part on an Emissions Controlled Vehicle
For coil-on-plug with no spark plug wires.
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.
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Holley EFI HEMI Coil Harness 558-311: