Part #: 558-121

Brand: Holley EFI


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Introducing 2x4 Terminator Stealth EFI upgrade components. The wait is over. These upgrade components allow you to use your current Terminator Stealth EFI throttle body, install a new main harness, and slave throttle body, and you are finished. This upgrade is also perfect for anyone wanting to convert their 2x4 supercharged combo over to Electronic Fuel Injection!

Terminator Stealth 2x4 MAIN HARNESS

Part #: 558-121
  • Length: 14"
  • Width: 14"
  • Height: 5"
  • Emissions Code: 3
  • Prop 65: No


  • 2x4 Side Mount Stealth Throttle Bodies – Provide the great looks of a classic Holley 4150 Carburetor
  • without any of the hassles
  • Multiple Color options allows for any Terminator Stealth EFI system to be upgraded to a 2x4
  • Plug and Play Main Harness provides a clean finished appearance and allows for a quick install!
  • Laptop Tuning is Required with this upgrade
  • we recommend taking your vehicle to a certified Holley EFI Tuner/Installer