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Holley Main Power Harnesses 558-308 Fuel Injection System Wiring Harness, EFI, Power, Universal, Speed Density/Throttle, 13 ft. Long, for Avenger, HP, Dominator EFI, Kit

Holley Main Power Harnesses 558-308 Fuel Injection System Wiring Harness, EFI, Power, Universal, Speed Density/Throttle, 13 ft. Long, for Avenger, HP, Dominator EFI, Kit

A$346.21
IN STOCK! Est Ship 4-7 days. In stock at 2 locations (more than 10 available)

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Description

EFI Wiring Harness - Main Power - Holley Dominator EFI - Each


Data: v2 - Desc: v4.2 - Upd: 2026-11-08 02:15:29

Data: v4.2 - Upd: 2026-11-11 03:13:25

Features

Vehicle Compatibility and Return Conditions.

This item was designed and engineered in the USA for US domestic vehicles. OBD tools, ECUs, dongles, programmers, and tuners may have limited compatibility with vehicles outside the USA due to regional differences in emission standards and system configurations. Some features and functionality may vary depending on the vehicle and location.

Some electronic tuning devices and programmers require activation, registration, or pairing with a specific vehicle’s VIN (Vehicle Identification Number). Once activated or paired, these devices may become permanently associated with that vehicle, restricting or preventing their use on another vehicle, resticting our ability to offer returns or exchanges.

Please review the product details and images to ensure it meets your needs. For clarification or assistance, feel free to contact a StreetFX agent. Note: Returns are not accepted for special order or tuning products unless the unit is deemed faulty.

(keyword: efi)

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Specifications

Reference Information

Reference Data (Provide these details to our support team)
Brand Name/s Holley, Hilborn, Holley Efi, Retrobright, Terminator X
StreetFX SKU hly558-308
SFX Item ID 4782692
Accounting SKU hly-558-308
Manufacturer SKU 558-308
Manufacturer UPC 090127666791
Alternative References 558-308, HLY-558-308, HOL558-308

Fuel Injection System Wiring Harness, Holley EFI, Main Power, Universal, Speed Density/Throttle, 13 ft. Long, for Avenger, HP, Dominator EFI, Kit

Holley main power ignition harnesses are designed for use with your Holly EFI systems. These wiring harnesses work with other Holley components to correctly configure your EFI system.

Product Attributes
BrandHolley
Manufacturer's Part Number558-308
Part TypeFuel Injection System Wiring Harnesses
Product LineHolley Main Power Harnesses
UPC090127666791
Fuel Injection StyleMulti-port
Metering StyleSpeed density (Map-N) or speed throttle (Alpha-N)
QuantitySold as a kit.
NotesFor use with Holley HP or Dominator EFI systems. Harness measures 13 ft. long. 2 ring terminals and shrink tube are included.

Compatibility

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