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Holley EFI

Holley EFI 558-503 GM TPI and Stealth Ram EFI Harness Kit

Part # 558-503 Be the first to write a review

GM TPI and Holley Stealth Ram&trade:

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Holley EFI 558-503 GM TPI and Stealth Ram EFI Harness Kit

Estimated Ship Date: 07/02/2026
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An EFI system depends heavily on being supplied a clean and constant voltage source. The grounds of an electrical system are just as important as the power side. Holley's Holley EFI Harness Kit comes complete with the main harness, power harness and injector harness to support your primary system!

Features:

  • Harness Kit Includes: Stealthram/TPI Main Harness, Main Power Harness, V-8 Injector Harness, HEI Ign Harness and Ignition Adapter & Tach Input
  • Simple Installation
  • Works with HP or Dominator ECU's
Brand Holley EFI
Emission Code4
Product TypeEFI Harnesses
WarrantyManufacturer's Limited 90 Day (1 Year with Warranty Registration)
UPC090127721346
Manufacturer Part Number558-503
Part Number558-503
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

Instructions for Part# 558-503
EFI selection chart
<b> NOTICE: You will need to purchase a ECU and O2 Sensor to make this a complete kit.
Manufacturer's Limited 90 Day (1 Year with Warranty Registration): See Details
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    *Free Shipping & Handling only offered to the contiguous US on orders over $149, excludes clearance parts and oversized packages.

    Some parts are not legal for use in California or other states with similar regulations.