{"product_id":"hp-efi-ecu-harness-kits-550-603n","title":"HP EFI ECU \u0026 Harness Kits 550-603N","description":"\u003cp\u003eGM LS2\/3\/7 (58x crank sensor) with USCAR (EV6 Style) connectors on injector harness, Includes NTK Oxygen Sensor\u003c\/p\u003e\n\u003cp\u003eFeatures:\u003cbr\u003e1-5 Bar MAP sensor capability\u003cbr\u003eECU is certified to ISO 8846, SAE J1171 \u0026amp; United States Coast Guard Requirements for Ignition Protection \u0026amp; Fire Resistance\u003cbr\u003eEasy To Use - Laptop programmable ECU includes a variety of base maps that will have you hitting the cruise or track in no time\u003cbr\u003eMore Functionality - Provides significantly more functionality than OEM or other competitive ECUs (boost control, nitrous control, water\/meth injection, plus a host of additional inputs and outputs to control fans, pumps, relays etc.)\u003cbr\u003eECU is fully potted and can be mounted in the engine compartment or interior\u003cbr\u003eFor a full list of advanced features such as boost, nitrous, water\/meth, individual cylinder control and more click the document icon under the product image!\u003cbr\u003eOptional plug and play hand-held programmer, 5.7\" touch screen and digital gauges are available for ultimate control and vehicle monitoring\u003cbr\u003eSealed automotive and marine grade connectors\u003cbr\u003eIndustry Leading Self Tuning Fuel Strategy - means less time tuning and more time enjoying the power of your LS vehicle\u003cbr\u003eThe NTK Oxygen Sensor is recommended when using leaded or methanol fuels, high exhaust and forced induction applications or for highest precision feedback\u003cbr\u003eSimple Installation - Plug and Play control of GM LS2\/LS3\/LS7 engines. Just plug the harness into your factory sensors, wire the power and grounds and you are ready to take complete control of your LS engine\u003cbr\u003eIdeal For Everything - including stock 5.3L engine swaps or all out, 3,000+ horsepower race cars that need a simple and powerful ECU and harness solution\u003cbr\u003eKit includes ECU, harness, communication cable, software, USCAR (EV6 Style) injector connectors, and NTK wideband O2 sensor, designed to be used with GM LS2\/LS3\/LS7 engines with factory GM coils and a 58 tooth crank sensor\u003c\/p\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":49453428572398,"sku":"HLY-550-603N","price":3099.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/9110\/6798\/files\/Screenshot2026-08-20225321.png?v=1787284467","url":"https:\/\/elmosspeedshop.com\/products\/hp-efi-ecu-harness-kits-550-603n","provider":"Elmo's Speed Shop","version":"1.0","type":"link"}