Holley

Holley Electronic Throttle Harness - 558-121

Part #
558-121
Line:
HLY

Product Information

Applications for this Product

  • This product is universal and applies to all vehicles.

Detailed Description

Main Harness; 2 X 4; Electronic Fuel Injection Upgrade;

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!.

  • 2x4 Side Mount
  • Provides The Great Looks Of A Classic Holley 4150 Carb
  • Multiple Color Options Allows For Any EFI System To Be Upgraded
  • Plug and Play Main Harness Provides A Clean Finished Appearance
  • Allows For Quick Install
  • Laptop Tuning Is Required With This Upgrade
  • We Recommend Taking To Certified Holley EFI Tuner/Installer

Brand Information

Holley(R) has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR(R) Sprint(R) Cup team and nearly every NHRA(R) Pro-Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds and engine dress-up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers(R), Flowtech(R) Exhaust, NOS(R) Nitrous, Weiand(R), Earl's Performance Plumbing(R), or Diablosport(R)- Holley products can give you the edge you need over the competition.
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