Holley EFI 550-603 HP EFI ECU & Harness Kits

Holley HP EFI ECU & Wiring Harness Kit for GM LS2/LS3/LS7 (Part #HLY550-603)Modern EFI Control For Your LS Engine Swap You are swapping an LS engine into your project car. Or you are upgrading the factory ECU on your LS2, LS3, or LS7. The factory computer is limiting. It is locked. It is not tunable for boost, nitrous, or big power.This is the Holley HP EFI ECU and Harness Kit. Part #HLY550-603. Designed specifically for GM LS2, LS3, and LS7 engines with the 58x crank sensor and USCAR (EV6) injector connectors .It is a complete plug-and-play system. ECU. Wiring harness. Communication cable. Software. Wideband O2 sensor. Everything you need to take full control of your LS engine .Why Holley HP EFI? The HP ECU is laptop programmable . You can tune fuel and ignition with precision. It offers significantly more functionality than the factory ECU. Boost control. Nitrous control. Water/methanol injection control. Individual cylinder fuel and spark corrections . It controls fans, pumps, and relays. You name it, it can manage it .The self-tuning fuel strategy is industry-leading. Less time tuning. More time driving . Got a stock LS engine? Download a base map and you are on your way . Got a turbocharged, nitrous-fed, high-horsepower race engine? This system can handle that too . It is ideal for everything from a stock 5.3L swap to a 3,000 horsepower race car .What Is Included? The kit is complete. HP EFI ECU. Main wiring harness. Communication cable. EFI software. USCAR (EV6) injector connectors. A wideband oxygen sensor is also included .Features & BenefitsPlug and Play Installation: Designed for GM LS2/LS3/LS7 engines. Reuses factory GM ignition coil harnesses. Just plug the harness into your factory sensors, wire power and ground, and you are ready to go .Complete Engine Control: Manage fuel and ignition for up to 16 injectors and 8 coils .Advanced Features: Boost control, progressive nitrous control (up to 4 stages), water/methanol injection control, traction control support, individual cylinder fuel and spark control, and knock control .Self-Tuning Fuel Strategy: Significantly simplifies the tuning process .Durable and Sealed: The ECU is fully potted and can be mounted in the engine compartment or interior. It features sealed automotive and marine-grade connectors .Certified: Certified to ISO 8846, SAE J1171 & United States Coast Guard Requirements for Ignition Protection & Fire Resistance .Vehicle Fitment This kit is designed for the following engines:GM LS2 (6.0L, 2005-2007)GM LS3 (6.2L, 2008-2017)GM LS7 (7.0L, 2006-2015)GM L92 / L76 / L94 (6.0L/6.2L truck engines with 58x crank sensors and rectangular port heads) Requires:58x crank reluctor wheel .USCAR (EV6) injector connectors .FAQ Is this a complete plug-and-play kit for my LS2?  Yes. It is designed for GM LS2/LS3/LS7 engines. It plugs into your existing factory sensors . Do I need to use a laptop to tune this ECU? A: Yes, the ECU is laptop programmable . It includes a variety of base maps to get you started . Does the kit include an oxygen sensor?  Yes. The kit includes a wideband oxygen sensor. Some versions come with a Bosch sensor , and others with an NTK sensor, which is recommended for leaded fuels or high-heat applications . Can this ECU control boost and nitrous? Yes. The Holley HP EFI system can control boost, progressive nitrous, and water/methanol injection . What is the difference between the HP and Dominator ECU?  The HP EFI system has 4 programmable inputs and 4 programmable outputs. If you need more I/O for complex controls, you would need the Dominator ECU .[NB: Last Chance Deals item : Limited stock. Please confirm fitment before ordering. No returns on incorrect orders. Transit damage claims only.]