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-10% HP ECU and Harness Kit, GM LS2/3/7

By now you have already figured out that Holley provides unparalleled support for the various GM LS engines. Complete kits are available for these engines in virtually every category of the Holley product line. And it's no different for the Holley HP EFI ECU and Harness kits. In the event that you con't spot a complete ktt that has exactly what you need for your GM LS2/LS3/LS7 engine, this is the ideal place to start.

This kit features an LS1/LS6 main harness, which allows plug-and-play connections to all of the LS engine's factory engine sensors as well as the factory ECU's and ignition. A Bosch or NTK Wideband O2 sensor is included so you can replace the narrow-band O2 sensor included in most LS installations. The main power harness for the ECU is included too (of course), so by the time you have this kit in hand you have virtually everything you need to do a basic Holley installation on your LS. From there, the sky's the limit!  You even get the option to upgrade to a Dominator ECU without losing the package price incentive offered by Holley

Free ECU Setup--Seriously?

For a limited time when you buy one of our Holley HP and ECU Kits we will ship it pre-configured for your basic setup at no additional charge. That means as soon as you get everything installed this should give you the ability to crank the engine--much like the Setup Wizard does on systems like the Sniper or Terminator. Note that this does not include tuning services or setup of things like nitrous control, boost control, transbrake setup, etc. However, whenever you purchase an EFI System from EFI System Pro you get our Level 3 Platinum EFI System Support at no extra charge. We're going to be there to help you be successful with your EFI system installation!

Boost ControlIntegrated (Utilizing at least two I/O Ports.) Control based on time, gear, speend, and/or manual selection. Requires 557-200 Boost Control Solenoid Valve.
Fueling StrategySpeed Density, Alpha-N, or Combination
Internal Datalogging4 GB
Nitrous ControlIntegrated 4 Stage (Utilizing at least two I/O ports.) Progressive control utilizing 554-111 solenoid driver.
User Configurable I/O4 programmable PWM outputs (2 high and 2 low) and 4 fully configurable inputs.
Water-Methanol ControlIntegrated (Utilizing at least two I/O Ports.) Recommend Holley Water-Methanol pump, nozzles, and install kit.
Harness TypePower Harness, LS2/LS2/LS7 Main Harness, LSx Injector Harness for EV6-Style Injectors, LSx Ignition Harness
TypeWideband O2 (Bosch) (Uses other OE LS engine sensors)
ApplicationGM LS2, LS3, LS7
Emission Code3
Unit of SaleKit

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HP ECU and Harness Kit, GM LS2/3/7

  • Views: 19834
  • Brand: Holley EFI
  • Product Code: 550-603 | 550-603N
  • Availability: In Stock
  • $2,899.00
  • $2,608.95

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