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Holley EFI 558-503 - GM TPI and Stealth Ram EFI HARNESS KIT

GM TPI and Holley Stealth Ram™

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. Our Holley EFI Harness Kit comes complete with the main harness, power harness and injector harness to support your primary system!
Availability: Call to check stock.
Shipping: Free Shipping* On Orders Over $99!
Pricing: $609.95

Free U.S. Continental Shipping


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

California Proposition 65

California Prop 65WARNING: Cancer & Reproductive Harm -


NOTICE: You will need to purchase a ECU and O2 Sensor to make this a complete kit.


  • 558-503
  • 558-503
  • 090127721346
  • Holley EFI
  • Call to check stock.
  • New

Shipping Information

  • Item Requires Shipping
  • 8.0 lbs.
  • W15.0000” x H5.0000” x L14.0000”
  • Free U.S. Continental Shipping
  • Free Shipping* On Orders Over $99!

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