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Holley Performance 550-605 HP EFI ECU And Harness Kit

4785404 - 550-605

GM LS2 - Incl. ECU/Harness - Unterminated Universal Harness - Incl. Bosch Oxygen Sensor

550-605 HP EFI ECU And Harness Kit Holley Performance

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Holley Performance - HP EFI ECU And Harness Kit - Part#: 550-605 Features:

  • Simple Installation - Plug And Play
  • Boost Control - Boost Vs Time/Gear/Rpm/Speed Over-Boost Safety
  • 5.7 in. Color Touchscreen For On-The-Fly Tune/DataLog/Gauge Panel
  • Advance Idle/Closed Loop/Enrichment Strategy For Stable Operation
  • Industry Leading Self Tuning Fuel Strategy
  • ECU Is Fully Potted And Can Be Mounted In Engine Comp Or Intr.
  • Sealed Automotive And Marine Grade Connectors
  • Calibrated To Enter Percent Flow Of Injector Flow For Precisi

View the Full List of Automotive Applications »

Below is an abbreviated list of applications for the HP EFI ECU And Harness Kit.


Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR Sprint Cup team and nearly every NHRA 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 & 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, Flowtech Exhaust, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.

Shipping Information

  • Item Requires Shipping
  • 9.0 lbs.
  • W11.5000” x H6.9000” x L23.0000”

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