HOLLEY EFI 558-500 Gm Ls Harness Kit 090127721315 24X

( Brand: Holley Efi ), ( Part Type: Harness ), ( UPC: 090127721315 ), ( Manufacturer Part Number: 558-500 )

Review HOLLEY EFI Gm Ls 24x Harness Kit

The Holley EFI 558-500 GM LS 24x Harness Kit is a high-performance wiring solution designed specifically for GM LS engines, enabling the seamless integration of Holley's EFI system into your engine bay. This harness kit is an essential component of any Holley EFI system installation, and its meticulous design and construction ensure a reliable and trouble-free experience.

The 558-500 GM LS 24x Harness Kit is engineered to support up to 24 injectors and includes an array of sensors, such as coolant temperature, intake air temperature, manifold absolute pressure, and throttle position. All wiring connections are color-coded and clearly labeled for easy identification and installation.

The harness kit is built with heavy-duty, 100% silicone insulated wiring, ensuring excellent electrical conductivity and resistance to wear and damage. The wiring is also shielded to minimize electrical noise and interference. The connector bodies are made from UV-resistant, reinforced nylon, providing superior protection against environmental conditions.

This harness kit includes a power distribution box, which houses the main relay and fuse panel. The power distribution box is designed to simplify wiring routing and organization, making the installation process more manageable. It also features a conveniently located fuse panel, ensuring easy access for maintenance and troubleshooting.

The Holley EFI 558-500 GM LS 24x Harness Kit is compatible with various Holley EFI controllers, including the Holley EFI Dominator and Holley EFI Pro HP. It is essential to note that the specific controller may affect the availability of certain features and sensor options.

Installing the Holley EFI 558-500 GM LS 24x Harness Kit requires a basic understanding of engine wiring and electrical systems. It is recommended that you consult the installation manual and seek professional assistance if necessary. With its precise engineering, high-quality materials, and comprehensive feature set, the Holley EFI 558-500 GM LS 24x Harness Kit is an indispensable tool for any serious LS engine enthusiast looking to upgrade their engine management system.

The Holley EFI 558-500 GM LS 24x harness kit is a popular choice for those looking to convert their GM LS engine to electronic fuel injection. Here are some pros and cons to help you make an informed decision:

1. Plug-and-play design: The harness kit is designed to be a direct replacement for the stock GM LS harness, making the installation process relatively straightforward and easier compared to building a custom wiring harness from scratch.

2. Compatibility: The 558-500 harness kit is compatible with a wide range of Holley EFI systems, including the Holley Terminal, Holley EFI, and Holley HP EFI. This provides flexibility in choosing the right EFI system for your specific application.

3. High-quality components: The harness kit is manufactured using high-quality, heavy-duty materials that can withstand the rigors of racing and high-performance applications.

4. Wide range of sensors supported: The harness kit supports a wide range of sensors, including temperature, pressure, and crank position sensors, providing accurate and reliable fuel injection and engine management.

1. Cost: The Holley EFI 558-500 GM LS 24x harness kit is a premium product and can be quite expensive compared to other aftermarket harness kits or building a custom wiring harness.

2. Limited customization: Since the harness kit is designed to be a direct replacement for the stock harness, there may be limited customization options for those looking to add unique features or modifications to their engine setup.

3. Complexity: While the harness kit is designed to be plug-and-play, the installation process can still be complex, especially for those without prior experience in wiring and engine management systems.

In conclusion, the Holley EFI 558-500 GM LS 24x harness kit offers several advantages, including ease of installation, compatibility with various EFI systems, high-quality components, and wide sensor support. However, it also comes with some drawbacks, such as cost, limited customization, and complexity.

If you are looking for a reliable and easy-to-install solution for converting your GM LS engine to electronic fuel injection and are willing to invest in a premium product, then the Holley EFI 558-500 GM LS 24x harness kit is a solid choice. On the other hand, if you are on a tight budget or require extensive customization options, you may want to consider alternative solutions or building a custom wiring harness. Ultimately, the decision comes down to your specific needs and priorities.

part # 558500 price

• $1024.95

specifications injectiopug:

• brand: Holley Efi
• part type: Harness
• upc: 090127721315
• manufacturer part number: 558-500

seller injectiopug:

• # reviews: 18781
• rating: 99.4%

offer injectiopug:

• quantity: 5
• started: January 15, 2026
• options: Ship-to-home
• availability: In Stock
• sold: 0

general injectiopug:

• Air Fuel Delivery > Fuel Injection Parts > Additional Fuel Injection Parts
• condition: New

payments injectiopug:

• credit card: Mastercard
• wallet: Apple-pay
• other

shipping injectiopug:

• carrier: UPS
• type: Fixed
• cost: $0.00
• class: Standard
• transit: 5-8 Days
• service: UPS Ground

returns injectiopug:

• time: 30 Days
• policy: Returns Accepted
• paid by: Seller

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