Holley EFI Coil Harness
2006 and Later Chrysler Gen III HEMI Engines
558-311
Overview:
The Holley EFI Gen III HEMI Coil Harness is engineered specifically for late-model Gen III HEMI engines, providing a seamless connection for the advanced coil design introduced in 2006 and beyond. Chrysler’s Gen III HEMI engines transitioned from early coils requiring spark plug wires to a more modern coil design with integrated boots that connect directly to the spark plugs. This harness is tailored to support the later coil style, enabling precise control of fuel and spark through Holley EFI systems.
Designed for enthusiasts and professional tuners alike, this coil harness is ideal for those upgrading their Gen III HEMI with Holley EFI for enhanced engine management, whether for power upgrades, engine swaps, or forced induction applications. It delivers reliable, OEM-quality connections that ensure optimal performance and tuning flexibility.
Key Features:
Built to complement Holley EFI’s advanced engine management capabilities, this coil harness offers numerous benefits for Gen III HEMI owners:
- Compatible with late Gen III HEMI coil packs that connect directly to spark plugs without spark plug wires
- Enables full control of fuel and spark timing through Holley EFI for precise tuning
- Supports power adders such as nitrous oxide, superchargers, turbos, and is compatible with methanol and water injection systems
- Constructed with TXL grade copper wiring for minimal weight and high temperature resistance
- Factory-style terminations and OEM-grade connectors ensure secure, positive fitment and reliable electrical connections
- Wiring is routed through a split-loom braid for enhanced protection and a clean, professional appearance
- Designed specifically for the Gen III HEMI engine platform to guarantee proper fit and function
Construction & Design:
The Holley EFI coil harness is crafted with high-quality TXL copper wiring, known for its excellent conductivity and resistance to heat and abrasion. The wiring is sheathed in a durable high-temperature sleeve and routed through a split-loom braid, providing robust protection against engine bay hazards while maintaining a sleek, factory-like look. Each connector is OEM-grade, ensuring a precise fit that matches factory specifications, which minimizes installation issues and maximizes reliability.
Every aspect of the harness is engineered to meet the demanding environment of the Gen III HEMI engine bay, delivering long-lasting performance and durability under high heat and vibration conditions.
Installation & Fitment:
This coil harness is designed for direct fitment on late Gen III HEMI engines equipped with the coil packs introduced in 2006 and later. Installation is straightforward, requiring no modifications to the engine or ignition system. The harness plugs directly into the factory coil connectors and spark plugs, simplifying the upgrade process for Holley EFI users.
It is essential to verify that your engine uses the late coil design without spark plug wires before purchasing. Reference the included image gallery to distinguish between early and late coil types to ensure compatibility.
What's Included:
- Holley EFI Gen III HEMI Coil Harness for late coil packs
- OEM-grade connectors pre-installed
- Split-loom protective braid covering the wiring
- Installation instructions and reference images
Ideal For:
This coil harness is perfect for Gen III HEMI owners looking to upgrade their ignition system with Holley EFI for improved tuning capabilities. It suits performance enthusiasts performing engine swaps, forced induction upgrades, or those seeking precise control over fuel and spark timing. Professional tuners and DIY builders alike will benefit from its plug-and-play design and robust construction.
Holley EFI delivers standalone engine management and EFI systems built for everything from engine swaps to serious horsepower builds. With platforms like Sniper, Terminator X, HP, and Dominator, Holley EFI is aimed at enthusiasts who want modern tuning control, data, and drivability—whether it’s a street car, track car, or full-on race program.
Holley EFI Gen III HEMI Coil Harness: Chrysler 300 (05-15) / Dodge Ram 1500 (03-10)
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558-311 Holley EFI 03-10 Dodge Ram 1500 / 05-15 Chrysler 300 Gen III HEMI Coil Harness. Holley EFI Coil Harnesses provide precise control of fuel and spark for Gen III HEMI engines, perfect for power upgrades and engine swaps. Designed for late coil models without spark plug wires, this harness supports tuning with nitrous, superchargers, turbos, and is compatible with methanol and water injection. Featuring TXL grade copper wiring, OEM-grade connectors, and protective split-loom braid, it ensures reliable connections and a clean, professional installation.
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Holley EFI Coil Harness
2006 and Later Chrysler Gen III HEMI Engines
558-311
Overview:
The Holley EFI Gen III HEMI Coil Harness is engineered specifically for late-model Gen III HEMI engines, providing a seamless connection for the advanced coil design introduced in 2006 and beyond. Chrysler’s Gen III HEMI engines transitioned from early coils requiring spark plug wires to a more modern coil design with integrated boots that connect directly to the spark plugs. This harness is tailored to support the later coil style, enabling precise control of fuel and spark through Holley EFI systems.
Designed for enthusiasts and professional tuners alike, this coil harness is ideal for those upgrading their Gen III HEMI with Holley EFI for enhanced engine management, whether for power upgrades, engine swaps, or forced induction applications. It delivers reliable, OEM-quality connections that ensure optimal performance and tuning flexibility.
Key Features:
Built to complement Holley EFI’s advanced engine management capabilities, this coil harness offers numerous benefits for Gen III HEMI owners:
- Compatible with late Gen III HEMI coil packs that connect directly to spark plugs without spark plug wires
- Enables full control of fuel and spark timing through Holley EFI for precise tuning
- Supports power adders such as nitrous oxide, superchargers, turbos, and is compatible with methanol and water injection systems
- Constructed with TXL grade copper wiring for minimal weight and high temperature resistance
- Factory-style terminations and OEM-grade connectors ensure secure, positive fitment and reliable electrical connections
- Wiring is routed through a split-loom braid for enhanced protection and a clean, professional appearance
- Designed specifically for the Gen III HEMI engine platform to guarantee proper fit and function
Construction & Design:
The Holley EFI coil harness is crafted with high-quality TXL copper wiring, known for its excellent conductivity and resistance to heat and abrasion. The wiring is sheathed in a durable high-temperature sleeve and routed through a split-loom braid, providing robust protection against engine bay hazards while maintaining a sleek, factory-like look. Each connector is OEM-grade, ensuring a precise fit that matches factory specifications, which minimizes installation issues and maximizes reliability.
Every aspect of the harness is engineered to meet the demanding environment of the Gen III HEMI engine bay, delivering long-lasting performance and durability under high heat and vibration conditions.
Installation & Fitment:
This coil harness is designed for direct fitment on late Gen III HEMI engines equipped with the coil packs introduced in 2006 and later. Installation is straightforward, requiring no modifications to the engine or ignition system. The harness plugs directly into the factory coil connectors and spark plugs, simplifying the upgrade process for Holley EFI users.
It is essential to verify that your engine uses the late coil design without spark plug wires before purchasing. Reference the included image gallery to distinguish between early and late coil types to ensure compatibility.
What's Included:
- Holley EFI Gen III HEMI Coil Harness for late coil packs
- OEM-grade connectors pre-installed
- Split-loom protective braid covering the wiring
- Installation instructions and reference images
Ideal For:
This coil harness is perfect for Gen III HEMI owners looking to upgrade their ignition system with Holley EFI for improved tuning capabilities. It suits performance enthusiasts performing engine swaps, forced induction upgrades, or those seeking precise control over fuel and spark timing. Professional tuners and DIY builders alike will benefit from its plug-and-play design and robust construction.
Holley EFI delivers standalone engine management and EFI systems built for everything from engine swaps to serious horsepower builds. With platforms like Sniper, Terminator X, HP, and Dominator, Holley EFI is aimed at enthusiasts who want modern tuning control, data, and drivability—whether it’s a street car, track car, or full-on race program.
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YEARMAKEMODELSUBMODEL2012 - 2014Chrysler3006.4L 3922006 - 2010Chrysler300C6.1L SRT82002 - 2010DodgeRam5.7L Hemi
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Need to return an item? We make it easy. Email us and we'll send you a free return label with instructions on how to return.
Standard shipping
Free Standard Shipping on orders over $300. Select “Free Shipping” at checkout. *Exclusions apply on oversized and freight items.
Free Easy Returns
Need to return an item? We make it easy. Email us and we'll send you a free return label with instructions on how to return.