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 LS1/LS6 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. Your choice of either 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!  Need more power, Scotty?  Then beam this kit up to a Dominator ECU.

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!