{"title":"Fuel Injection Harness","description":null,"products":[{"product_id":"holley-efi-ev6-unterminated-injector-harness-kit-558-216","title":"Holley EV6 Unterminated Injector Harness Kit, 8-Cylinder, Universal | 558-216","description":"\u003cp\u003eThis EV6 unterminated injector harness kit includes everything needed to build a custom, cut-to-fit EV6 injector harness for an 8-cylinder engine. A quality metripack crimping tool (Holley 567-102) is available separately to complete the job.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Type: Injector\u003c\/li\u003e\n\u003cli\u003eHarness Application: Universal\u003c\/li\u003e\n\u003cli\u003eContents: 8x EV6 injector connectors with 36 in. of 20-gauge colored flying leads per connector\u003c\/li\u003e\n\u003cli\u003eIncludes: 10x pins and seals\u003c\/li\u003e\n\u003cli\u003eIncludes: 1x 10-pin metripack female connector and TPA to mate with a Holley EFI main harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-216\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eHow many cylinders does this harness kit support?\u003c\/h5\u003e\u003cp\u003eIt's designed to build a custom EV6 injector harness for an 8-cylinder engine.\u003c\/p\u003e\u003ch5\u003eDoes it come pre-terminated?\u003c\/h5\u003e\u003cp\u003eNo, it's unterminated — connectors, pins, seals, and flying leads are included so it can be cut and crimped to fit your install.\u003c\/p\u003e\u003ch5\u003eWhat connects it to my main harness?\u003c\/h5\u003e\u003cp\u003eA 10-pin metripack female connector with TPA is included to mate with a Holley EFI main harness.\u003c\/p\u003e\u003ch5\u003eWhat tool do I need to crimp the connectors?\u003c\/h5\u003e\u003cp\u003eA quality metripack crimping tool, such as Holley part 567-102, sold separately.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How many cylinders does this harness kit support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed to build a custom EV6 injector harness for an 8-cylinder engine.\"}},{\"@type\":\"Question\",\"name\":\"Does it come pre-terminated?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, it's unterminated — connectors, pins, seals, and flying leads are included so it can be cut and crimped to fit your install.\"}},{\"@type\":\"Question\",\"name\":\"What connects it to my main harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A 10-pin metripack female connector with TPA is included to mate with a Holley EFI main harness.\"}},{\"@type\":\"Question\",\"name\":\"What tool do I need to crimp the connectors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A quality metripack crimping tool, such as Holley part 567-102, sold separately.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418589171760,"sku":"GVMR_558-216","price":158.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-216_0118330.jpg?v=1758385899"},{"product_id":"8-male-to-female-can-adapter-harness-558-453","title":"Holley 8' Male to Female CAN Adapter Harness, For Racepak \u0026 External CAN 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Title","offer_id":42418589302832,"sku":"GVMR_558-453","price":70.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-453_01_895cfa3b-daa2-4d24-9b26-331a6b60fc9d.jpg?v=1758385913"},{"product_id":"12-male-to-female-can-adapter-harness-558-451","title":"Holley 12\" Male to Female CAN Adapter Harness, For Racepak \u0026 External CAN Devices | 558-451","description":"\u003cp\u003eThis 12 in. male-to-female CAN adapter harness connects Racepak and other external CAN devices to a Holley EFI system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eLength: 12 in.\u003c\/li\u003e\n\u003cli\u003eProduct Type: CAN Extension Harness\u003c\/li\u003e\n\u003cli\u003eHarness Type: Fuel Injection Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-451\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat is this harness used for?\u003c\/h5\u003e\u003cp\u003eIt extends a CAN connection between a Holley EFI system and external CAN devices such as a Racepak.\u003c\/p\u003e\u003ch5\u003eHow long is this harness?\u003c\/h5\u003e\u003cp\u003e12 inches.\u003c\/p\u003e\u003ch5\u003eIs this a male or female harness?\u003c\/h5\u003e\u003cp\u003eIt adapts male to female, letting it extend or bridge existing CAN connections.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is this harness used for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It extends a CAN connection between a Holley EFI system and external CAN devices such as a Racepak.\"}},{\"@type\":\"Question\",\"name\":\"How long is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"12 inches.\"}},{\"@type\":\"Question\",\"name\":\"Is this a male or female harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It adapts male to female, letting it extend or bridge existing CAN connections.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418589368368,"sku":"GVMR_558-451","price":46.61,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-451_01.jpg?v=1758385920"},{"product_id":"holley-efi-ford-gt500-and-3v-drive-by-wire-throttle-body-harness-558-461","title":"Holley Ford GT500 \u0026 3V Drive-by-Wire Throttle Body Harness, 2005-2010 Mustang GT\/GT500 | 558-461","description":"\u003cp\u003eThis Holley EFI drive-by-wire throttle body harness is built for the OEM Ford throttle body commonly found on 2005-2010 Mustang GT and GT500 models. 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with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Ford P\/Ns BR3Z-9F836-D and BR3Z-9F836-C.\"}},{\"@type\":\"Question\",\"name\":\"Is this throttle body supported in Holley EFI software?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it's a default dropdown selection in Holley EFI V5 software.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418589433904,"sku":"GVMR_558-461","price":499.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-461_01.jpg?v=1758385929"},{"product_id":"tpi-stealth-ram™-main-harness-for-avenger-efi-hp-efi-dominator-efi-558-101","title":"Holley TPI\/Stealth Ram Main Harness, For Avenger EFI, HP EFI \u0026 Dominator EFI | 558-101","description":"\u003cp\u003eThis GM Tuned Port\/Holley Stealth Ram engine harness is the main harness for Avenger EFI, HP EFI, and Dominator EFI 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type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What EFI systems is this harness used with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Avenger EFI, HP EFI, and Dominator EFI.\"}},{\"@type\":\"Question\",\"name\":\"What engine platform is it designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"GM Tuned Port Injection (TPI) and Holley Stealth Ram intake setups.\"}},{\"@type\":\"Question\",\"name\":\"Is this the main harness or an accessory harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This is the main engine harness.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418589761584,"sku":"GVMR_558-101","price":675.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-101_01.jpg?v=1758385966"},{"product_id":"v8-over-manifold-bosch-style-injector-harness-558-200","title":"Holley V8 Over-Manifold Bosch-Style Injector Harness, GM\/Chrysler Cylinder Orientation | 558-200","description":"\u003cp\u003eThis V8 over-manifold, Bosch-style connector harness is built for Avenger EFI, HP EFI, Dominator EFI, and Terminator X systems, in GM\/Chrysler cylinder orientation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: Universal\u003c\/li\u003e\n\u003cli\u003eHarness Type: Injector\u003c\/li\u003e\n\u003cli\u003eProduct Type: Bosch EV1 Style Injector Harness\u003c\/li\u003e\n\u003cli\u003eCylinder Orientation: GM\/Chrysler\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-200\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat EFI systems is this harness compatible with?\u003c\/h5\u003e\u003cp\u003eAvenger EFI, HP EFI, Dominator EFI, and Terminator X.\u003c\/p\u003e\u003ch5\u003eWhat injector style does it use?\u003c\/h5\u003e\u003cp\u003eBosch\/EV1-style connectors, routed for over-manifold V8 injector locations.\u003c\/p\u003e\u003ch5\u003eWhat cylinder orientation is this harness built for?\u003c\/h5\u003e\u003cp\u003eGM\/Chrysler cylinder orientation.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What EFI systems is this harness compatible with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Avenger EFI, HP EFI, Dominator EFI, and Terminator X.\"}},{\"@type\":\"Question\",\"name\":\"What injector style does it use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Bosch\/EV1-style connectors, routed for over-manifold V8 injector locations.\"}},{\"@type\":\"Question\",\"name\":\"What cylinder orientation is this harness built for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"GM\/Chrysler cylinder orientation.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418589827120,"sku":"GVMR_558-200","price":212.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-200_01.jpg?v=1758385973"},{"product_id":"can-extension-harness-9-558-428","title":"Holley CAN Extension Harness, 9 Inch, For Racepak \u0026 External CAN Devices | 558-428","description":"\u003cp\u003eThis 9 in. CAN extension harness connects Racepak and other external CAN devices to a Holley EFI system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eLength: 9 in.\u003c\/li\u003e\n\u003cli\u003eProduct Type: CAN Extension Harness\u003c\/li\u003e\n\u003cli\u003eHarness Type: Fuel Injection Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-428\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat is this harness used for?\u003c\/h5\u003e\u003cp\u003eIt extends a CAN connection between a Holley EFI system and external CAN devices such as a Racepak.\u003c\/p\u003e\u003ch5\u003eHow long is this harness?\u003c\/h5\u003e\u003cp\u003e9 inches.\u003c\/p\u003e\u003ch5\u003eIs this a direct extension or an adapter?\u003c\/h5\u003e\u003cp\u003eIt's a straight extension harness, not a male-to-female adapter.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is this harness used for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It extends a CAN connection between a Holley EFI system and external CAN devices such as a Racepak.\"}},{\"@type\":\"Question\",\"name\":\"How long is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"9 inches.\"}},{\"@type\":\"Question\",\"name\":\"Is this a direct extension or an adapter?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's a straight extension harness, not a male-to-female adapter.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418589990960,"sku":"GVMR_558-428","price":56.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-428_01.jpg?v=1758385991"},{"product_id":"can-extension-harness-12ft-558-426","title":"Holley EFI CAN Extension Harness, 12FT | 558-426","description":"\u003cp\u003eThis 12-foot CAN extension harness lets you extend the CAN bus connection between a Holley EFI system and an external CAN-based device, such as a Racepak data logger.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eLength: 12 ft.\u003c\/li\u003e\n\u003cli\u003eApplication: Racepak and other external CAN-based devices\u003c\/li\u003e\n\u003cli\u003eProduct Type: CAN Extension Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-426\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eUse this harness to relocate or extend a CAN connection point without splicing into the factory Holley EFI main harness.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eHow long is this CAN extension harness?\u003c\/h5\u003e\u003cp\u003eThis harness measures 12 feet, giving extra reach when connecting a Holley EFI system to an external CAN device.\u003c\/p\u003e\u003ch5\u003eWhat is this harness used for?\u003c\/h5\u003e\u003cp\u003eIt extends the CAN bus connection between a Holley EFI system and an external CAN-based accessory, such as a Racepak data logger.\u003c\/p\u003e\u003ch5\u003eDoes installing this harness require splicing into the main harness?\u003c\/h5\u003e\u003cp\u003eNo, it plugs directly into the existing CAN circuit as an extension, without any splicing required.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis 12-foot CAN extension harness is Holley part number 558-426.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How long is this CAN extension harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This harness measures 12 feet, giving extra reach when connecting a Holley EFI system to an external CAN device.\"}},{\"@type\":\"Question\",\"name\":\"What is this harness used for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It extends the CAN bus connection between a Holley EFI system and an external CAN-based accessory, such as a Racepak data logger.\"}},{\"@type\":\"Question\",\"name\":\"Does installing this harness require splicing into the main harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, it plugs directly into the existing CAN circuit as an extension, without any splicing required.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This 12-foot CAN extension harness is Holley part number 558-426.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418590187568,"sku":"GVMR_558-426","price":84.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-426_01.jpg?v=1758385999"},{"product_id":"can-extension-harness-8-558-425","title":"Holley EFI CAN Extension Harness, 8FT | 558-425","description":"\u003cp\u003eThis 8-foot CAN extension harness lets you extend the CAN bus connection between a Holley EFI system and an external CAN-based device, such as a Racepak data logger.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eLength: 8 ft.\u003c\/li\u003e\n\u003cli\u003eApplication: Racepak and other external CAN-based devices\u003c\/li\u003e\n\u003cli\u003eProduct Type: CAN Extension Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-425\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eUse this harness to relocate or extend a CAN connection point without splicing into the factory Holley EFI main harness.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eHow long is this CAN extension harness?\u003c\/h5\u003e\u003cp\u003eThis harness measures 8 feet, giving extra reach when connecting a Holley EFI system to an external CAN device.\u003c\/p\u003e\u003ch5\u003eWhat is this harness used for?\u003c\/h5\u003e\u003cp\u003eIt extends the CAN bus connection between a Holley EFI system and an external CAN-based accessory, such as a Racepak data logger.\u003c\/p\u003e\u003ch5\u003eDoes installing this harness require splicing into the main harness?\u003c\/h5\u003e\u003cp\u003eNo, it plugs directly into the existing CAN circuit as an extension, without any splicing required.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis 8-foot CAN extension harness is Holley part number 558-425.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How long is this CAN extension harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This harness measures 8 feet, giving extra reach when connecting a Holley EFI system to an external CAN device.\"}},{\"@type\":\"Question\",\"name\":\"What is this harness used for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It extends the CAN bus connection between a Holley EFI system and an external CAN-based accessory, such as a Racepak data logger.\"}},{\"@type\":\"Question\",\"name\":\"Does installing this harness require splicing into the main harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, it plugs directly into the existing CAN circuit as an extension, without any splicing required.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This 8-foot CAN extension harness is Holley part number 558-425.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418590253104,"sku":"GVMR_558-425","price":70.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-425_01.jpg?v=1758386006"},{"product_id":"can-extension-harness-4-558-424","title":"Holley EFI CAN Extension Harness, 4FT | 558-424","description":"\u003cp\u003eThis 4-foot CAN extension harness lets you extend the CAN bus connection between a Holley EFI system and an external CAN-based device, such as a Racepak data logger.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eLength: 4 ft.\u003c\/li\u003e\n\u003cli\u003eApplication: Universal — Racepak and other external CAN-based devices\u003c\/li\u003e\n\u003cli\u003eProduct Type: CAN Extension Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-424\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eUse this harness to relocate or extend a CAN connection point without splicing into the factory Holley EFI main harness.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eHow long is this CAN extension harness?\u003c\/h5\u003e\u003cp\u003eThis harness measures 4 feet, giving extra reach when connecting a Holley EFI system to an external CAN device.\u003c\/p\u003e\u003ch5\u003eWhat is this harness used for?\u003c\/h5\u003e\u003cp\u003eIt extends the CAN bus connection between a Holley EFI system and an external CAN-based accessory, such as a Racepak data logger.\u003c\/p\u003e\u003ch5\u003eDoes installing this harness require splicing into the main harness?\u003c\/h5\u003e\u003cp\u003eNo, it plugs directly into the existing CAN circuit as an extension, without any splicing required.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis 4-foot CAN extension harness is Holley part number 558-424.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How long is this CAN extension harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This harness measures 4 feet, giving extra reach when connecting a Holley EFI system to an external CAN device.\"}},{\"@type\":\"Question\",\"name\":\"What is this harness used for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It extends the CAN bus connection between a Holley EFI system and an external CAN-based accessory, such as a Racepak data logger.\"}},{\"@type\":\"Question\",\"name\":\"Does installing this harness require splicing into the main harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, it plugs directly into the existing CAN circuit as an extension, without any splicing required.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This 4-foot CAN extension harness is Holley part number 558-424.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418590318640,"sku":"GVMR_558-424","price":63.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-424_01.jpg?v=1758386014"},{"product_id":"ls2-3-7-58x-4x-engine-main-harness-for-hp-efi-dominator-efi-558-103","title":"Holley EFI LS2\/3\/7+ (58x\/4x) Engine Main Harness, For HP EFI \u0026 Dominator EFI | 558-103","description":"\u003cp\u003eThis LS2\/3\/7+ engine main harness is designed to interface with 58x crank and 4x cam sensors, covering the LS variants commonly found in 2006-and-newer GM vehicles such as the LS2, LS3, LS7, L76, L92, and L98.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCrank Reluctor: 58x\u003c\/li\u003e\n\u003cli\u003eHarness Application: LSX\u003c\/li\u003e\n\u003cli\u003eHarness Type: Main\u003c\/li\u003e\n\u003cli\u003eCompatible Engines: LS2, LS3, LS7, L76, L92, L98 (2006+)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play with Dominator, HP, Terminator X, and Terminator X Max ECUs\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-103\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. 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558-103.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Which LS engines does this main harness fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for 58x crank\/4x cam sensor LS engines, including the LS2, LS3, LS7, L76, L92, and L98 found in 2006-and-newer GM vehicles.\"}},{\"@type\":\"Question\",\"name\":\"Which Holley EFI ECUs is this harness compatible with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It plugs in directly with Dominator, HP, Terminator X, and Terminator X Max ECUs.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness legal for street use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This LS2\/3\/7+ (58x\/4x) engine main harness is Holley part number 558-103.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418590384176,"sku":"GVMR_558-103","price":675.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/mainharness.jpg?v=1758386021"},{"product_id":"dominator-efi-gm-dual-drive-by-wire-harness-558-411","title":"Holley EFI Dominator EFI GM Dual Drive-By-Wire Harness | 558-411","description":"\u003cp\u003eThis Dominator EFI GM dual drive-by-wire harness connects a Holley Dominator EFI system to a GM dual drive-by-wire throttle setup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: GM, LSX\u003c\/li\u003e\n\u003cli\u003eHarness Type: Drive-By-Wire\u003c\/li\u003e\n\u003cli\u003eProduct Type: Drive By Wire Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-411\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat is this harness used for?\u003c\/h5\u003e\u003cp\u003eIt's a drive-by-wire harness that connects a Holley Dominator EFI system to a GM dual drive-by-wire throttle setup.\u003c\/p\u003e\u003ch5\u003eWhich vehicle platforms does this harness apply to?\u003c\/h5\u003e\u003cp\u003eIt's built for GM and LSX applications.\u003c\/p\u003e\u003ch5\u003eWhat ECU system does this harness pair with?\u003c\/h5\u003e\u003cp\u003eThis harness is designed for use with Holley's Dominator EFI system.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis Dominator EFI GM dual drive-by-wire harness is Holley part number 558-411.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is this harness used for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's a drive-by-wire harness that connects a Holley Dominator EFI system to a GM dual drive-by-wire throttle setup.\"}},{\"@type\":\"Question\",\"name\":\"Which vehicle platforms does this harness apply to?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for GM and LSX applications.\"}},{\"@type\":\"Question\",\"name\":\"What ECU system does this harness pair with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This harness is designed for use with Holley's Dominator EFI system.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This Dominator EFI GM dual drive-by-wire harness is Holley part number 558-411.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418590449712,"sku":"GVMR_558-411","price":399.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-411_01.jpg?v=1758386030"},{"product_id":"terminator-x-max-and-dominator-efi-gm-drive-by-wire-harness-558-406","title":"Holley EFI GM Drive-By-Wire Harness, For Dominator EFI \u0026 Terminator X Max | 558-406","description":"\u003cp\u003eThis GM drive-by-wire harness connects a Holley Dominator EFI or Terminator X Max system to a GM electronic throttle body and throttle pedal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: GM, LSX\u003c\/li\u003e\n\u003cli\u003eHarness Type: Drive-By-Wire\u003c\/li\u003e\n\u003cli\u003eCompatible ECUs: Dominator EFI, Terminator X Max\u003c\/li\u003e\n\u003cli\u003ePlug-and-Play with Holley Throttle Pedal (145-160)\u003c\/li\u003e\n\u003cli\u003eDesigned for GM Throttle Body P\/N's 12570790 and 12580760\u003c\/li\u003e\n\u003cli\u003eDesigned for GM Throttle Pedal P\/N's 10379038 and 19417903\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-406\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eVerify vehicle application and fitment before installation.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhich Holley EFI systems does this harness work with?\u003c\/h5\u003e\u003cp\u003eIt's built for Dominator EFI and Terminator X Max systems.\u003c\/p\u003e\u003ch5\u003eWhat GM throttle body does this harness fit?\u003c\/h5\u003e\u003cp\u003eIt's designed to work with GM throttle body part numbers 12570790 and 12580760.\u003c\/p\u003e\u003ch5\u003eWhat GM throttle pedal does this harness fit?\u003c\/h5\u003e\u003cp\u003eIt's designed for GM throttle pedal part numbers 10379038 and 19417903, and is plug-and-play with Holley's own throttle pedal, part number 145-160.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis GM drive-by-wire harness is Holley part number 558-406.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Which Holley EFI systems does this harness work with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for Dominator EFI and Terminator X Max systems.\"}},{\"@type\":\"Question\",\"name\":\"What GM throttle body does this harness fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed to work with GM throttle body part numbers 12570790 and 12580760.\"}},{\"@type\":\"Question\",\"name\":\"What GM throttle pedal does this harness fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for GM throttle pedal part numbers 10379038 and 19417903, and is plug-and-play with Holley's own throttle pedal, part number 145-160.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This GM drive-by-wire harness is Holley part number 558-406.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418590548016,"sku":"GVMR_558-406","price":259.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-406_01.jpg?v=1758386038"},{"product_id":"main-engine-harness-for-58x-ls-w-tbi-558-112","title":"Holley EFI Main Engine Harness, 58x\/4x Gen 4 LS with Terminator TBI | 558-112","description":"\u003cp\u003eThis main engine harness is intended for use with Dominator, HP, Terminator X, and Terminator X Max ECUs when running a Terminator or Terminator Stealth throttle body injection unit on a Gen 4 58x LS engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eApplication: Gen 4 58x LS engines\u003c\/li\u003e\n\u003cli\u003eCompatible ECUs: Dominator, HP, Terminator X, Terminator X Max\u003c\/li\u003e\n\u003cli\u003eCrank and cam sensor plugs for Gen 4 58x LS engines\u003c\/li\u003e\n\u003cli\u003eEven\/Odd LS coil harness plugs\u003c\/li\u003e\n\u003cli\u003eBulkhead connector for Holley 534-225 and 534-227 (and similar) throttle body injection units\u003c\/li\u003e\n\u003cli\u003eProduct Type: Terminator LS Main Engine Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-112\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat LS engines is this harness designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for Gen 4 58x LS engines when paired with a Terminator or Terminator Stealth throttle body injection unit.\u003c\/p\u003e\u003ch5\u003eWhich Holley EFI ECUs does this harness work with?\u003c\/h5\u003e\u003cp\u003eIt's designed for Dominator, HP, Terminator X, and Terminator X Max ECUs.\u003c\/p\u003e\u003ch5\u003eWhat throttle body units does this harness's bulkhead connector fit?\u003c\/h5\u003e\u003cp\u003eThe bulkhead connector fits Holley part numbers 534-225 and 534-227, and similar throttle body injection units.\u003c\/p\u003e\u003ch5\u003eIs this harness legal for street use?\u003c\/h5\u003e\u003cp\u003eNo. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis main engine harness for 58x LS with TBI is Holley part number 558-112.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What LS engines is this harness designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for Gen 4 58x LS engines when paired with a Terminator or Terminator Stealth throttle body injection unit.\"}},{\"@type\":\"Question\",\"name\":\"Which Holley EFI ECUs does this harness work with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for Dominator, HP, Terminator X, and Terminator X Max ECUs.\"}},{\"@type\":\"Question\",\"name\":\"What throttle body units does this harness's bulkhead connector fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The bulkhead connector fits Holley part numbers 534-225 and 534-227, and similar throttle body injection units.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness legal for street use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This main engine harness for 58x LS with TBI is Holley part number 558-112.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418590613552,"sku":"GVMR_558-112","price":727.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-112.jpg?v=1758386045"},{"product_id":"main-engine-harness-for-24x-ls-w-tbi-558-111","title":"Holley EFI Main Engine Harness, 24x\/1x Gen 3 LS with Terminator TBI | 558-111","description":"\u003cp\u003eThis main engine harness is intended for use with Dominator, HP, Terminator X, and Terminator X Max ECUs when running a Terminator or Terminator Stealth throttle body injection unit on a Gen 3 24x LS engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eApplication: Gen 3 24x LS engines\u003c\/li\u003e\n\u003cli\u003eCompatible ECUs: Dominator, HP, Terminator X, Terminator X Max\u003c\/li\u003e\n\u003cli\u003eCrank and cam sensor plugs for Gen 3 24x LS engines\u003c\/li\u003e\n\u003cli\u003eEven\/Odd LS coil harness plugs\u003c\/li\u003e\n\u003cli\u003eBulkhead connector for Holley 534-225 and 534-227 (and similar) throttle body injection units\u003c\/li\u003e\n\u003cli\u003eProduct Type: Terminator LS Main Engine Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-111\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eOnly compatible with Terminator TBI throttle bodies — not for Multi-Port Fuel Injection (MPFI) applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat LS engines is this harness designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for Gen 3 24x LS engines when paired with a Terminator or Terminator Stealth throttle body injection unit.\u003c\/p\u003e\u003ch5\u003eDoes this harness work with MPFI setups?\u003c\/h5\u003e\u003cp\u003eNo, it's only compatible with Terminator TBI throttle bodies, not Multi-Port Fuel Injection.\u003c\/p\u003e\u003ch5\u003eWhich Holley EFI ECUs does this harness work with?\u003c\/h5\u003e\u003cp\u003eIt's designed for Dominator, HP, Terminator X, and Terminator X Max ECUs.\u003c\/p\u003e\u003ch5\u003eIs this harness legal for street use?\u003c\/h5\u003e\u003cp\u003eNo. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis main engine harness for 24x LS with TBI is Holley part number 558-111.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What LS engines is this harness designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for Gen 3 24x LS engines when paired with a Terminator or Terminator Stealth throttle body injection unit.\"}},{\"@type\":\"Question\",\"name\":\"Does this harness work with MPFI setups?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, it's only compatible with Terminator TBI throttle bodies, not Multi-Port Fuel Injection.\"}},{\"@type\":\"Question\",\"name\":\"Which Holley EFI ECUs does this harness work with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for Dominator, HP, Terminator X, and Terminator X Max ECUs.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness legal for street use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This main engine harness for 24x LS with TBI is Holley part number 558-111.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418590679088,"sku":"GVMR_558-111","price":749.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-111.jpg?v=1758386052"},{"product_id":"ford-2v-4v-modular-main-harness-for-hp-efi-dominator-efi-558-108","title":"Holley EFI Ford 2V \u0026 4V Modular Main Harness, For HP EFI \u0026 Dominator EFI | 558-108","description":"\u003cp\u003eThis main harness fits 1999-2004 Ford 2-valve and 4-valve Modular 4.6L and 5.4L engines and is designed for use with Holley's HP EFI and Dominator EFI systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eApplication: 1999-2004 Ford Modular 4.6L \u0026amp; 5.4L, 2V and 4V\u003c\/li\u003e\n\u003cli\u003eHarness Application: Ford\u003c\/li\u003e\n\u003cli\u003eHarness Type: Main\u003c\/li\u003e\n\u003cli\u003eCompatible ECUs: HP EFI, Dominator EFI\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-108\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat Ford engines does this main harness fit?\u003c\/h5\u003e\u003cp\u003eIt fits 1999-2004 Ford Modular 4.6L and 5.4L engines, both 2-valve and 4-valve.\u003c\/p\u003e\u003ch5\u003eWhich Holley EFI systems is this harness designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for use with Holley's HP EFI and Dominator EFI systems.\u003c\/p\u003e\u003ch5\u003eIs this harness legal for street use?\u003c\/h5\u003e\u003cp\u003eNo. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis Ford 2V \u0026amp; 4V Modular main harness is Holley part number 558-108.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What Ford engines does this main harness fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It fits 1999-2004 Ford Modular 4.6L and 5.4L engines, both 2-valve and 4-valve.\"}},{\"@type\":\"Question\",\"name\":\"Which Holley EFI systems is this harness designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for use with Holley's HP EFI and Dominator EFI systems.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness legal for street use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This Ford 2V \u0026 4V Modular main harness is Holley part number 558-108.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418590875696,"sku":"GVMR_558-108","price":849.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-108.jpg?v=1758386059"},{"product_id":"unterminated-universal-main-harness-for-hp-efi-dominator-efi-558-105","title":"Holley EFI Unterminated Universal Main Harness, For HP EFI \u0026 Dominator EFI | 558-105","description":"\u003cp\u003eThis unterminated universal main harness gives you flexibility for custom routing and wire lengths when wiring a Holley HP EFI or Dominator EFI system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: Universal\u003c\/li\u003e\n\u003cli\u003eHarness Type: Main\u003c\/li\u003e\n\u003cli\u003eCompatible ECUs: HP EFI, Dominator EFI\u003c\/li\u003e\n\u003cli\u003eUnterminated — allows custom routing and wire lengths\u003c\/li\u003e\n\u003cli\u003eIncludes multiple connectors and pins\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-105\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does \"unterminated\" mean for this harness?\u003c\/h5\u003e\u003cp\u003eIt means the wires are not pre-terminated, allowing you to route and length the wiring to fit a custom installation.\u003c\/p\u003e\u003ch5\u003eWhich Holley EFI systems is this harness designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for use with Holley's HP EFI and Dominator EFI systems.\u003c\/p\u003e\u003ch5\u003eDoes this harness include connectors and pins?\u003c\/h5\u003e\u003cp\u003eYes, it comes with multiple connectors and pins for a custom build.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis unterminated universal main harness is Holley part number 558-105.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does \\\"unterminated\\\" mean for this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It means the wires are not pre-terminated, allowing you to route and length the wiring to fit a custom installation.\"}},{\"@type\":\"Question\",\"name\":\"Which Holley EFI systems is this harness designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for use with Holley's HP EFI and Dominator EFI systems.\"}},{\"@type\":\"Question\",\"name\":\"Does this harness include connectors and pins?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it comes with multiple connectors and pins for a custom build.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This unterminated universal main harness is Holley part number 558-105.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418590941232,"sku":"GVMR_558-105","price":571.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-105.jpg?v=1758386067"},{"product_id":"universal-mpfi-main-harness-for-hp-efi-dominator-efi-558-104","title":"Holley EFI Universal MPFI Main Harness, For HP EFI \u0026 Dominator EFI | 558-104","description":"\u003cp\u003eThis universal MPFI main harness is designed for wiring a Holley HP EFI or Dominator EFI system into Ford, GM, or universal multi-port fuel injection applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: Ford, GM, Universal\u003c\/li\u003e\n\u003cli\u003eHarness Type: Main\u003c\/li\u003e\n\u003cli\u003eCompatible ECUs: HP EFI, Dominator EFI\u003c\/li\u003e\n\u003cli\u003eProduct Type: Universal MPI Main Engine Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-104\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat vehicle platforms does this harness support?\u003c\/h5\u003e\u003cp\u003eIt's built for Ford, GM, and universal multi-port fuel injection applications.\u003c\/p\u003e\u003ch5\u003eWhich Holley EFI systems is this harness designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for use with Holley's HP EFI and Dominator EFI systems.\u003c\/p\u003e\u003ch5\u003eIs this a main harness or an accessory harness?\u003c\/h5\u003e\u003cp\u003eIt's a main harness, used as the core wiring connection for the EFI system.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis universal MPFI main harness is Holley part number 558-104.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What vehicle platforms does this harness support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for Ford, GM, and universal multi-port fuel injection applications.\"}},{\"@type\":\"Question\",\"name\":\"Which Holley EFI systems is this harness designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for use with Holley's HP EFI and Dominator EFI systems.\"}},{\"@type\":\"Question\",\"name\":\"Is this a main harness or an accessory harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's a main harness, used as the core wiring connection for the EFI system.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This universal MPFI main harness is Holley part number 558-104.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418591006768,"sku":"GVMR_558-104","price":571.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/largemainharness558_104.jpg?v=1758386073"},{"product_id":"hp-efi-ecu-harness-kits-550-617n","title":"Holley EFI HP EFI ECU \u0026 Harness Kit, Ford Modular 4V, Jetronic Injectors | 550-617N","description":"\u003cp\u003eBuilt for 1999-2004 Ford Modular 4-valve engines, this HP EFI ECU and harness kit is a complete plug-and-play solution that accurately controls fuel and ignition, with headroom for wild cam profiles and power adders.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned specifically for 1999-2004 Ford Modular 4-valve engines\u003c\/li\u003e\n\u003cli\u003ePlug and play with factory sensors — crank, cam, TPS, coolant temp, and more\u003c\/li\u003e\n\u003cli\u003ePlug and play with factory actuators — coils, injectors, IAC\u003c\/li\u003e\n\u003cli\u003eConnectors included for Holley fuel pressure and oil pressure sensors\u003c\/li\u003e\n\u003cli\u003eConnectors for expanded inputs and outputs\u003c\/li\u003e\n\u003cli\u003eComplete kit includes HP ECU, NTK oxygen sensor, MAP sensor, coil drivers, and all necessary harnesses\u003c\/li\u003e\n\u003cli\u003eNTK oxygen sensor recommended for leaded or methanol fuels, high-exhaust and forced-induction applications, or highest-precision feedback\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs for boost control, progressive nitrous, water\/meth injection, speed inputs, fuel pump control, AC inputs, timing retard, and more\u003c\/li\u003e\n\u003cli\u003eFree software and firmware updates available for download\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: Ford Modular Motor\u003c\/li\u003e\n\u003cli\u003eIgnition Type: 4V Ford Modular\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic \/ Minitimer (Bosch)\u003c\/li\u003e\n\u003cli\u003eProduct Type: HP EFI Kit\u003c\/li\u003e\n\u003cli\u003eWhat's Included: HP ECU, NTK O2 sensor, MAP sensor, coil drivers, harnesses\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-617N\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis kit's 4 inputs and 4 outputs suit most vehicles running a single power adder. If your build needs more I\/O than that — multiple power adders or a more complex control scheme — step up to a Dominator VMS-based kit instead.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engine is this HP EFI kit designed for?\u003c\/h5\u003e\u003cp\u003eIt's built specifically for 1999-2004 Ford Modular 4-valve engines.\u003c\/p\u003e\u003ch5\u003eWhat's included in this kit?\u003c\/h5\u003e\u003cp\u003eThe complete plug-and-play kit includes the HP ECU, an NTK oxygen sensor, a MAP sensor, coil drivers, and all necessary harnesses.\u003c\/p\u003e\u003ch5\u003eHow many programmable inputs and outputs does the HP ECU have?\u003c\/h5\u003e\u003cp\u003eIt has 4 programmable inputs and 4 programmable outputs, suitable for controls like boost, progressive nitrous, water\/meth injection, and fuel pump control.\u003c\/p\u003e\u003ch5\u003eWhat if my build needs more than 4 inputs and 4 outputs?\u003c\/h5\u003e\u003cp\u003eIf your combination requires more I\/O than this kit provides, Holley recommends stepping up to a Dominator VMS-based system.\u003c\/p\u003e\u003ch5\u003eWhy is the NTK oxygen sensor recommended?\u003c\/h5\u003e\u003cp\u003eIt's recommended for leaded or methanol fuels, high-exhaust and forced-induction applications, or anywhere the highest-precision feedback is needed.\u003c\/p\u003e\u003ch5\u003eWhat part number is this kit?\u003c\/h5\u003e\u003cp\u003eThis HP EFI ECU and harness kit is Holley part number 550-617N.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engine is this HP EFI kit designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built specifically for 1999-2004 Ford Modular 4-valve engines.\"}},{\"@type\":\"Question\",\"name\":\"What's included in this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The complete plug-and-play kit includes the HP ECU, an NTK oxygen sensor, a MAP sensor, coil drivers, and all necessary harnesses.\"}},{\"@type\":\"Question\",\"name\":\"How many programmable inputs and outputs does the HP ECU have?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It has 4 programmable inputs and 4 programmable outputs, suitable for controls like boost, progressive nitrous, water\/meth injection, and fuel pump control.\"}},{\"@type\":\"Question\",\"name\":\"What if my build needs more than 4 inputs and 4 outputs?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"If your combination requires more I\/O than this kit provides, Holley recommends stepping up to a Dominator VMS-based system.\"}},{\"@type\":\"Question\",\"name\":\"Why is the NTK oxygen sensor recommended?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's recommended for leaded or methanol fuels, high-exhaust and forced-induction applications, or anywhere the highest-precision feedback is needed.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This HP EFI ECU and harness kit is Holley part number 550-617N.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418591072304,"sku":"GVMR_550-617N","price":3549.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-617N_02.jpg?v=1758386081"},{"product_id":"gen-iii-hemi-v8-injector-harness-bosch-jetronic-and-holley-injectors-558-211","title":"Holley EFI Gen III HEMI V8 Injector Harness, Bosch\/Jetronic Style | 558-211","description":"\u003cp\u003eHolley offers two Gen III HEMI injector harnesses — this one is built for Bosch, Holley, and Jetronic\/Minitimer style injector connectors commonly used in aftermarket, larger-injector applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: HEMI\u003c\/li\u003e\n\u003cli\u003eHarness Type: Injector\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Bosch \/ Jetronic \/ Holley (Minitimer)\u003c\/li\u003e\n\u003cli\u003eWiring: TXL-grade copper with high-temp sleeve, routed through split-loom braid\u003c\/li\u003e\n\u003cli\u003eProduct Type: HEMI Injector Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-211\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThe Gen III HEMI's Variable Valve Timing is not supported by Holley EFI systems — cam timing reverts to the mechanical default. The Multi-Displacement System (MDS) does not need to be connected when switching to a Holley EFI system. This part is not legal for sale or use on pollution-controlled vehicles.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat injector style does this harness use?\u003c\/h5\u003e\u003cp\u003eIt's built for Bosch, Holley, and Jetronic\/Minitimer style injector connectors, commonly used in aftermarket larger-injector applications.\u003c\/p\u003e\u003ch5\u003eDoes this harness support the HEMI's Variable Valve Timing?\u003c\/h5\u003e\u003cp\u003eNo, VVT is not currently supported by Holley EFI systems — cam timing reverts to its mechanical default.\u003c\/p\u003e\u003ch5\u003eDo I need to connect the Multi-Displacement System (MDS)?\u003c\/h5\u003e\u003cp\u003eNo, MDS does not need to be connected when switching to a Holley EFI system.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis Gen III HEMI V8 injector harness (Bosch\/Jetronic style) is Holley part number 558-211.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What injector style does this harness use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for Bosch, Holley, and Jetronic\/Minitimer style injector connectors, commonly used in aftermarket larger-injector applications.\"}},{\"@type\":\"Question\",\"name\":\"Does this harness support the HEMI's Variable Valve Timing?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, VVT is not currently supported by Holley EFI systems — cam timing reverts to its mechanical default.\"}},{\"@type\":\"Question\",\"name\":\"Do I need to connect the Multi-Displacement System (MDS)?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, MDS does not need to be connected when switching to a Holley EFI system.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This Gen III HEMI V8 injector harness (Bosch\/Jetronic style) is Holley part number 558-211.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418591137840,"sku":"GVMR_558-211","price":199.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-211.jpg?v=1758386088"},{"product_id":"gen-iii-hemi-v8-injector-harness-stock-uscar-style-injectors-558-210","title":"Holley EFI Gen III HEMI V8 Injector Harness, Stock\/USCAR Style | 558-210","description":"\u003cp\u003eHolley offers two Gen III HEMI injector harnesses — this one is built for stock\/USCAR style injector connectors, covering most applications running factory injectors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: HEMI\u003c\/li\u003e\n\u003cli\u003eHarness Type: Injector\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Stock \/ USCAR\u003c\/li\u003e\n\u003cli\u003eWiring: TXL-grade copper with high-temp sleeve, routed through split-loom braid\u003c\/li\u003e\n\u003cli\u003eProduct Type: HEMI Injector Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-210\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThe Gen III HEMI's Variable Valve Timing is not supported by Holley EFI systems — cam timing reverts to the mechanical default. The Multi-Displacement System (MDS) does not need to be connected when switching to a Holley EFI system. This part is not legal for sale or use on pollution-controlled vehicles.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat injector style does this harness use?\u003c\/h5\u003e\u003cp\u003eIt's built for stock\/USCAR style injector connectors, covering most applications running factory injectors.\u003c\/p\u003e\u003ch5\u003eDoes this harness support the HEMI's Variable Valve Timing?\u003c\/h5\u003e\u003cp\u003eNo, VVT is not currently supported by Holley EFI systems — cam timing reverts to its mechanical default.\u003c\/p\u003e\u003ch5\u003eDo I need to connect the Multi-Displacement System (MDS)?\u003c\/h5\u003e\u003cp\u003eNo, MDS does not need to be connected when switching to a Holley EFI system.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis Gen III HEMI V8 injector harness (stock\/USCAR style) is Holley part number 558-210.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What injector style does this harness use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for stock\/USCAR style injector connectors, covering most applications running factory injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this harness support the HEMI's Variable Valve Timing?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, VVT is not currently supported by Holley EFI systems — cam timing reverts to its mechanical default.\"}},{\"@type\":\"Question\",\"name\":\"Do I need to connect the Multi-Displacement System (MDS)?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, MDS does not need to be connected when switching to a Holley EFI system.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This Gen III HEMI V8 injector harness (stock\/USCAR style) is Holley part number 558-210.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418591203376,"sku":"GVMR_558-210","price":207.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-210.jpg?v=1758386095"},{"product_id":"ford-v8-injector-harness-for-hp-efi-dominator-efi-558-209","title":"Holley EFI Ford V8 Injector Harness, For HP EFI \u0026 Dominator EFI | 558-209","description":"\u003cp\u003eThis Ford V8 injector harness is designed for wiring EV1-style fuel injectors on Holley HP EFI and Dominator EFI systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: Ford\u003c\/li\u003e\n\u003cli\u003eHarness Type: Injector\u003c\/li\u003e\n\u003cli\u003eProduct Type: Ford EV1 Style Injector Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-209\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat injector style does this harness support?\u003c\/h5\u003e\u003cp\u003eIt's built for Ford EV1-style fuel injectors.\u003c\/p\u003e\u003ch5\u003eWhich Holley EFI systems is this harness designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for use with Holley's HP EFI and Dominator EFI systems.\u003c\/p\u003e\u003ch5\u003eWhat vehicle platform is this harness for?\u003c\/h5\u003e\u003cp\u003eIt's designed for Ford applications.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis Ford V8 injector harness is Holley part number 558-209.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What injector style does this harness support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for Ford EV1-style fuel injectors.\"}},{\"@type\":\"Question\",\"name\":\"Which Holley EFI systems is this harness designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for use with Holley's HP EFI and Dominator EFI systems.\"}},{\"@type\":\"Question\",\"name\":\"What vehicle platform is this harness for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for Ford applications.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This Ford V8 injector harness is Holley part number 558-209.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418591268912,"sku":"GVMR_558-209","price":265.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-209_01.jpg?v=1758386102"},{"product_id":"ford-coyote-2011-2017-drive-by-wire-harness-558-422","title":"Holley EFI Ford Coyote Drive-By-Wire Harness, 2011-2017 5.0L | 558-422","description":"\u003cp\u003eThis drive-by-wire harness is built for 2011-2017 Ford Coyote 5.0L engines, connecting a Holley EFI system to the factory electronic throttle body and pedal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eApplication: 2011-2017 Ford Coyote (5.0L)\u003c\/li\u003e\n\u003cli\u003eConnector Count: 3\u003c\/li\u003e\n\u003cli\u003eDesigned for Ford Throttle Body P\/N's BR3Z-9E926-C, BR3E-9F991-AB, and FR3E-9F991-AA\u003c\/li\u003e\n\u003cli\u003eDesigned for Ford Throttle Pedal P\/N's BR3Z-9F836-D and BR3Z-9F836-C\u003c\/li\u003e\n\u003cli\u003eProduct Type: Drive By Wire Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-422\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engine does this drive-by-wire harness fit?\u003c\/h5\u003e\u003cp\u003eIt's built for 2011-2017 Ford Coyote 5.0L engines.\u003c\/p\u003e\u003ch5\u003eHow many connectors does this harness have?\u003c\/h5\u003e\u003cp\u003eIt has 3 connectors.\u003c\/p\u003e\u003ch5\u003eWhat throttle body and pedal does this harness work with?\u003c\/h5\u003e\u003cp\u003eIt's designed for Ford throttle body part numbers BR3Z-9E926-C, BR3E-9F991-AB, and FR3E-9F991-AA, and throttle pedal part numbers BR3Z-9F836-D and BR3Z-9F836-C.\u003c\/p\u003e\u003ch5\u003eIs this harness legal for street use?\u003c\/h5\u003e\u003cp\u003eNo. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis Ford Coyote drive-by-wire harness is Holley part number 558-422.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engine does this drive-by-wire harness fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for 2011-2017 Ford Coyote 5.0L engines.\"}},{\"@type\":\"Question\",\"name\":\"How many connectors does this harness have?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It has 3 connectors.\"}},{\"@type\":\"Question\",\"name\":\"What throttle body and pedal does this harness work with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for Ford throttle body part numbers BR3Z-9E926-C, BR3E-9F991-AB, and FR3E-9F991-AA, and throttle pedal part numbers BR3Z-9F836-D and BR3Z-9F836-C.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness legal for street use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This Ford Coyote drive-by-wire harness is Holley part number 558-422.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418591432752,"sku":"GVMR_558-422","price":299.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-422_01.jpg?v=1758386109"},{"product_id":"universal-6-cylinder-injector-harness-for-hp-efi-dominator-efi-558-203","title":"Holley EFI Universal 6 Cylinder Injector Harness, For HP EFI \u0026 Dominator EFI | 558-203","description":"\u003cp\u003eThis universal 6-cylinder injector harness is terminated and ready for plug-and-play injector connections on Holley HP EFI and Dominator EFI systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: Universal\u003c\/li\u003e\n\u003cli\u003eHarness Type: Injector\u003c\/li\u003e\n\u003cli\u003eTerminated — ready for plug-and-play injector connections\u003c\/li\u003e\n\u003cli\u003eProduct Type: Injector Harness - Connector\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-203\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eHow many cylinders does this injector harness support?\u003c\/h5\u003e\u003cp\u003eIt's designed for 6-cylinder applications.\u003c\/p\u003e\u003ch5\u003eIs this harness pre-terminated?\u003c\/h5\u003e\u003cp\u003eYes, it's fully terminated and ready for plug-and-play injector connections.\u003c\/p\u003e\u003ch5\u003eWhich Holley EFI systems is this harness designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for use with Holley's HP EFI and Dominator EFI systems.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis universal 6-cylinder injector harness is Holley part number 558-203.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How many cylinders does this injector harness support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for 6-cylinder applications.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness pre-terminated?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it's fully terminated and ready for plug-and-play injector connections.\"}},{\"@type\":\"Question\",\"name\":\"Which Holley EFI systems is this harness designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for use with Holley's HP EFI and Dominator EFI systems.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This universal 6-cylinder injector harness is Holley part number 558-203.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418591498288,"sku":"GVMR_558-203","price":225.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-203.jpg?v=1758386117"},{"product_id":"lsx-injector-harness-for-hp-efi-dominator-efi-and-terminator-x-558-201","title":"Holley EFI LSx Injector Harness, EV6 Style, For HP EFI, Dominator EFI \u0026 Terminator X | 558-201","description":"\u003cp\u003eThis LSx injector harness is built for EV6-style injectors and connects with Holley's HP EFI, Dominator EFI, and Terminator X systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: LSX\u003c\/li\u003e\n\u003cli\u003eHarness Type: Injector\u003c\/li\u003e\n\u003cli\u003eInjector Style: EV6\u003c\/li\u003e\n\u003cli\u003eCompatible ECUs: HP EFI, Dominator EFI, Terminator X\u003c\/li\u003e\n\u003cli\u003eProduct Type: LS EV6 Style Injector Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-201\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat injector style does this LSx harness use?\u003c\/h5\u003e\u003cp\u003eIt's built for EV6-style injectors.\u003c\/p\u003e\u003ch5\u003eWhich Holley EFI systems is this harness compatible with?\u003c\/h5\u003e\u003cp\u003eIt works with HP EFI, Dominator EFI, and Terminator X systems.\u003c\/p\u003e\u003ch5\u003eIs this harness legal for street use?\u003c\/h5\u003e\u003cp\u003eNo. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis LSx injector harness is Holley part number 558-201.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What injector style does this LSx harness use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for EV6-style injectors.\"}},{\"@type\":\"Question\",\"name\":\"Which Holley EFI systems is this harness compatible with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It works with HP EFI, Dominator EFI, and Terminator X systems.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness legal for street use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This LSx injector harness is Holley part number 558-201.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418591563824,"sku":"GVMR_558-201","price":189.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-201.jpg?v=1758386123"},{"product_id":"gen-iii-hemi-main-harness-early-w-tps-and-idle-air-control-connections-558-115","title":"Holley EFI Gen III HEMI Main Harness, Early w\/ TPS \u0026 Idle Air Control | 558-115","description":"\u003cp\u003eThis Gen III HEMI main harness interfaces a Holley EFI ECU to a Gen III HEMI engine running an aftermarket cable-actuated throttle body, with TPS and idle air control connections for the early crank\/cam sensor configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: HEMI\u003c\/li\u003e\n\u003cli\u003eHarness Type: Main\u003c\/li\u003e\n\u003cli\u003eIgnition Type: Gen III HEMI (Early)\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Not included (use with a separate injector harness)\u003c\/li\u003e\n\u003cli\u003eFor use with cable-actuated throttle body\u003c\/li\u003e\n\u003cli\u003eUsed together with an injector harness, coil harness, and two ignition modules\u003c\/li\u003e\n\u003cli\u003eOptional connectors for interfacing with CAN-based Holley modules\u003c\/li\u003e\n\u003cli\u003eProduct Type: Hemi Main Engine Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-115\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThe TPS and IAC connectors are designed for Holley 4-BBL style throttle bodies — a different throttle body may require different pins and connectors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does this main harness connect?\u003c\/h5\u003e\u003cp\u003eIt interfaces a Holley EFI ECU to a Gen III HEMI engine running an aftermarket cable-actuated throttle body.\u003c\/p\u003e\u003ch5\u003eDoes this harness include an injector connector?\u003c\/h5\u003e\u003cp\u003eNo, it's meant to be used alongside a separate injector harness, coil harness, and two ignition modules.\u003c\/p\u003e\u003ch5\u003eWhat throttle body is this harness's TPS\/IAC connector designed for?\u003c\/h5\u003e\u003cp\u003eIt's designed for Holley 4-BBL style throttle bodies; a different throttle body may require different pins and connectors.\u003c\/p\u003e\u003ch5\u003eIs this harness legal for street use?\u003c\/h5\u003e\u003cp\u003eNo. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis Gen III HEMI early main harness with TPS and idle air control connections is Holley part number 558-115.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does this main harness connect?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It interfaces a Holley EFI ECU to a Gen III HEMI engine running an aftermarket cable-actuated throttle body.\"}},{\"@type\":\"Question\",\"name\":\"Does this harness include an injector connector?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, it's meant to be used alongside a separate injector harness, coil harness, and two ignition modules.\"}},{\"@type\":\"Question\",\"name\":\"What throttle body is this harness's TPS\/IAC connector designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for Holley 4-BBL style throttle bodies; a different throttle body may require different pins and connectors.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness legal for street use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This Gen III HEMI early main harness with TPS and idle air control connections is Holley part number 558-115.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418591629360,"sku":"GVMR_558-115","price":899.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-106.jpg?v=1758386130"},{"product_id":"holley-efi-gm-drive-by-wire-harness-early-truck-558-429","title":"Holley EFI GM Drive-By-Wire Harness, Early Truck, Terminator X Max \u0026 Dominator EFI | 558-429","description":"\u003cp\u003eThis GM drive-by-wire harness is built for early truck applications, connecting a Holley Terminator X Max or Dominator EFI system to the factory electronic throttle setup, and is compatible with GM part number 10379038.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: GM, LSX\u003c\/li\u003e\n\u003cli\u003eHarness Type: Drive-By-Wire\u003c\/li\u003e\n\u003cli\u003eApplication: Early Truck\u003c\/li\u003e\n\u003cli\u003eCompatible with GM Part Number 10379038\u003c\/li\u003e\n\u003cli\u003eCompatible ECUs: Terminator X Max, Dominator EFI\u003c\/li\u003e\n\u003cli\u003eProduct Type: Drive By Wire Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-429\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat GM trucks does this drive-by-wire harness fit?\u003c\/h5\u003e\u003cp\u003eIt's designed for early GM truck applications and is compatible with GM part number 10379038.\u003c\/p\u003e\u003ch5\u003eWhich Holley EFI systems does this harness work with?\u003c\/h5\u003e\u003cp\u003eIt's built for Terminator X Max and Dominator EFI systems.\u003c\/p\u003e\u003ch5\u003eIs this harness legal for street use?\u003c\/h5\u003e\u003cp\u003eNo. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis GM drive-by-wire harness for early trucks is Holley part number 558-429.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What GM trucks does this drive-by-wire harness fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for early GM truck applications and is compatible with GM part number 10379038.\"}},{\"@type\":\"Question\",\"name\":\"Which Holley EFI systems does this harness work with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for Terminator X Max and Dominator EFI systems.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness legal for street use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This GM drive-by-wire harness for early trucks is Holley part number 558-429.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418591694896,"sku":"GVMR_558-429","price":285.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-429_01.jpg?v=1758386138"},{"product_id":"gm-4l60-80e-transmission-harness-for-1996-2008-transmissions-only-558-405","title":"Holley EFI Transmission Control Harness, GM 4L60 (Pre-2009) \u0026 4L80 | 558-405","description":"\u003cp\u003eThis transmission control harness provides plug-and-play wiring for pre-2009 GM 4L60 and 4L80 transmissions when running a Holley Dominator EFI system, and includes a J4 connector for electronic transmission operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: GM\u003c\/li\u003e\n\u003cli\u003eHarness Type: Transmission\u003c\/li\u003e\n\u003cli\u003eApplication: 1996-2008 GM 4L60 \/ 4L80\u003c\/li\u003e\n\u003cli\u003eMade for Dominator EFI\u003c\/li\u003e\n\u003cli\u003eIncludes J4 connector for electronic transmission\u003c\/li\u003e\n\u003cli\u003eFully terminated, plug-and-play harness with unterminated wires available for custom installation\u003c\/li\u003e\n\u003cli\u003eProduct Type: Transmission Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-405\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis harness is not compatible with 4WD installations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat transmissions does this harness support?\u003c\/h5\u003e\u003cp\u003eIt's built for pre-2009 GM 4L60 and 4L80 transmissions, covering 1996-2008 applications.\u003c\/p\u003e\u003ch5\u003eWhich Holley EFI ECU does this harness pair with?\u003c\/h5\u003e\u003cp\u003eIt's made for use with a Dominator EFI system.\u003c\/p\u003e\u003ch5\u003eIs this harness compatible with 4WD?\u003c\/h5\u003e\u003cp\u003eNo, this harness is not compatible with 4WD installations.\u003c\/p\u003e\u003ch5\u003eIs this harness legal for street use?\u003c\/h5\u003e\u003cp\u003eNo. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis GM 4L60\/4L80 transmission control harness is Holley part number 558-405.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What transmissions does this harness support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for pre-2009 GM 4L60 and 4L80 transmissions, covering 1996-2008 applications.\"}},{\"@type\":\"Question\",\"name\":\"Which Holley EFI ECU does this harness pair with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's made for use with a Dominator EFI system.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness compatible with 4WD?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this harness is not compatible with 4WD installations.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness legal for street use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This GM 4L60\/4L80 transmission control harness is Holley part number 558-405.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418592153648,"sku":"GVMR_558-405","price":318.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-405_0118305.jpg?v=1758386146"},{"product_id":"gen-iii-hemi-main-harness-late-w-tps-and-idle-air-control-connections-558-116","title":"Holley EFI Gen III HEMI Main Harness, Late w\/ TPS \u0026 Idle Air Control | 558-116","description":"\u003cp\u003eThis Gen III HEMI main harness interfaces a Holley EFI ECU to a Gen III HEMI engine running an aftermarket cable-actuated throttle body, with TPS and idle air control connections for the late crank\/cam sensor configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: HEMI\u003c\/li\u003e\n\u003cli\u003eHarness Type: Main\u003c\/li\u003e\n\u003cli\u003eConfiguration: Late crank and cam sensors\u003c\/li\u003e\n\u003cli\u003eIgnition Type \/ Injector Connector: Not included (use with a separate injector and ignition harness)\u003c\/li\u003e\n\u003cli\u003eFor use with cable-actuated throttle body\u003c\/li\u003e\n\u003cli\u003eCompatible with HP EFI \u0026amp; Dominator EFI\u003c\/li\u003e\n\u003cli\u003eProduct Type: Hemi Main Engine Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-116\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThe TPS and IAC connectors are designed for Holley 4-BBL style throttle bodies — a different throttle body may require different pins and connectors. When using this harness with a 60-2 ignition strategy, you must use a Chrysler 514-9230-AA crank sensor. This sensor is standard on 2009-12 Chrysler\/Dodge\/Jeep applications and is a direct replacement for 2013+ engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does this main harness connect?\u003c\/h5\u003e\u003cp\u003eIt interfaces a Holley EFI ECU to a Gen III HEMI engine running an aftermarket cable-actuated throttle body, for the late crank\/cam sensor configuration.\u003c\/p\u003e\u003ch5\u003eWhat crank sensor is required with a 60-2 ignition strategy?\u003c\/h5\u003e\u003cp\u003eYou must use a Chrysler 514-9230-AA crank sensor, which is standard on 2009-12 Chrysler\/Dodge\/Jeep applications and is a direct replacement for 2013+ engines.\u003c\/p\u003e\u003ch5\u003eWhat throttle body is this harness's TPS\/IAC connector designed for?\u003c\/h5\u003e\u003cp\u003eIt's designed for Holley 4-BBL style throttle bodies; a different throttle body may require different pins and connectors.\u003c\/p\u003e\u003ch5\u003eIs this harness legal for street use?\u003c\/h5\u003e\u003cp\u003eNo. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis Gen III HEMI late main harness with TPS and idle air control connections is Holley part number 558-116.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does this main harness connect?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It interfaces a Holley EFI ECU to a Gen III HEMI engine running an aftermarket cable-actuated throttle body, for the late crank\/cam sensor configuration.\"}},{\"@type\":\"Question\",\"name\":\"What crank sensor is required with a 60-2 ignition strategy?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"You must use a Chrysler 514-9230-AA crank sensor, which is standard on 2009-12 Chrysler\/Dodge\/Jeep applications and is a direct replacement for 2013+ engines.\"}},{\"@type\":\"Question\",\"name\":\"What throttle body is this harness's TPS\/IAC connector designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for Holley 4-BBL style throttle bodies; a different throttle body may require different pins and connectors.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness legal for street use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This Gen III HEMI late main harness with TPS and idle air control connections is Holley part number 558-116.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418592251952,"sku":"GVMR_558-116","price":849.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-107.jpg?v=1758386154"},{"product_id":"plug-and-play-with-dominator-ecu-558-219","title":"Holley EFI Injector Driver Harness, Plug-and-Play with Dominator ECU | 558-219","description":"\u003cp\u003eThis injector driver harness comes pre-terminated with a J2B connector for plug-and-play connectivity with a Holley Dominator ECU, designed for use with the \"custom\" staged injection strategy in Holley EFI V5 software.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eConnector: Pre-terminated J2B\u003c\/li\u003e\n\u003cli\u003eDesigned for Holley 554-143 injector driver module and 554-114 Dominator ECU\u003c\/li\u003e\n\u003cli\u003eTechflex F6 loomed harness for clean installation and dirt\/grime protection\u003c\/li\u003e\n\u003cli\u003eIncludes CAN connectors for network diagnostics\u003c\/li\u003e\n\u003cli\u003eSupports Custom Staged Injection strategy in Holley EFI V5+ software (16+ injectors)\u003c\/li\u003e\n\u003cli\u003eProduct Type: Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-219\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat ECU and module does this harness pair with?\u003c\/h5\u003e\u003cp\u003eIt's designed to work with the Holley 554-143 injector driver module and a 554-114 Dominator ECU.\u003c\/p\u003e\u003ch5\u003eWhat does the CAN connector on this harness allow?\u003c\/h5\u003e\u003cp\u003eIt allows you to quickly diagnose issues over the CAN network.\u003c\/p\u003e\u003ch5\u003eWhat software feature does this harness support?\u003c\/h5\u003e\u003cp\u003eIt supports the Custom Staged Injection strategy in Holley EFI V5 and up, letting you update your installation to 16+ injectors.\u003c\/p\u003e\u003ch5\u003eWhat part number is this harness?\u003c\/h5\u003e\u003cp\u003eThis injector driver harness is Holley part number 558-219.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What ECU and module does this harness pair with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed to work with the Holley 554-143 injector driver module and a 554-114 Dominator ECU.\"}},{\"@type\":\"Question\",\"name\":\"What does the CAN connector on this harness allow?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It allows you to quickly diagnose issues over the CAN network.\"}},{\"@type\":\"Question\",\"name\":\"What software feature does this harness support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It supports the Custom Staged Injection strategy in Holley EFI V5 and up, letting you update your installation to 16+ injectors.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This injector driver harness is Holley part number 558-219.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418592415792,"sku":"GVMR_558-219","price":331.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-219_01.jpg?v=1758386162"},{"product_id":"ls-multec-2-injector-harness-early-truck-558-214","title":"Holley EFI LS Multec 2 Injector Harness, Early Truck | 558-214","description":"\u003cp\u003eThis Holley EFI injector harness is built for LS engines using Multec 2 style injectors on early truck applications, providing a clean, direct-fit wiring connection for the fuel injectors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eType: Injector harness, Multec 2 style\u003c\/li\u003e\n\u003cli\u003eApplication: LS, early truck\u003c\/li\u003e\n\u003cli\u003eHarness Application: Universal\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-214\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat injector style is this harness built for?\u003c\/h5\u003e\u003cp\u003eIt's designed for Multec 2 style fuel injectors used on early LS truck applications.\u003c\/p\u003e\u003ch5\u003eCan this harness be installed on a street emissions vehicle?\u003c\/h5\u003e\u003cp\u003eNo. This part is designated for Racing Use Only vehicles and cannot legally be installed on an Emissions Controlled Vehicle.\u003c\/p\u003e\u003ch5\u003eWhat engine platform is this harness for?\u003c\/h5\u003e\u003cp\u003eIt's built for GM LS engines using the early truck Multec 2 injector configuration.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What injector style is this harness built for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for Multec 2 style fuel injectors used on early LS truck applications.\"}},{\"@type\":\"Question\",\"name\":\"Can this harness be installed on a street emissions vehicle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is designated for Racing Use Only vehicles and cannot legally be installed on an Emissions Controlled Vehicle.\"}},{\"@type\":\"Question\",\"name\":\"What engine platform is this harness for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for GM LS engines using the early truck Multec 2 injector configuration.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418594742320,"sku":"GVMR_558-214","price":291.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-214_01.jpg?v=1758386331"},{"product_id":"new-device-to-two-pin-main-harness-558-430","title":"Holley EFI CAN Adapter\/Power Harness, Two-Pin to 4-Pin Device | 558-430","description":"\u003cp\u003eThe Holley EFI CAN Adapter\/Power Harness adapts a two-pin Holley main harness CAN connector to a newer style 4-pin CAN device connector.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eType: CAN Adapter\/Power Harness\u003c\/li\u003e\n\u003cli\u003eAdapts: New 4-pin CAN device to two-pin Holley main harness CAN connector\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-430\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does this harness adapt between?\u003c\/h5\u003e\u003cp\u003eIt adapts a two-pin Holley main harness CAN connector to a newer style 4-pin CAN device connector.\u003c\/p\u003e\u003ch5\u003eWhat is this adapter used for?\u003c\/h5\u003e\u003cp\u003eIt allows newer CAN-based Holley EFI devices to connect to an existing two-pin main harness.\u003c\/p\u003e\u003ch5\u003eIs this a power harness as well as a CAN adapter?\u003c\/h5\u003e\u003cp\u003eYes, it functions as both a CAN adapter and power harness for the connected device.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does this harness adapt between?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It adapts a two-pin Holley main harness CAN connector to a newer style 4-pin CAN device connector.\"}},{\"@type\":\"Question\",\"name\":\"What is this adapter used for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It allows newer CAN-based Holley EFI devices to connect to an existing two-pin main harness.\"}},{\"@type\":\"Question\",\"name\":\"Is this a power harness as well as a CAN adapter?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it functions as both a CAN adapter and power harness for the connected device.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418594807856,"sku":"GVMR_558-430","price":44.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-430_01.jpg?v=1758386340"},{"product_id":"evenly-spaced-ford-v8-injector-harness-for-uscar-ev6-style-injectors-558-212","title":"Holley EFI Ford V8 Injector Harness, USCAR\/EV6 Style, Evenly Spaced | 558-212","description":"\u003cp\u003eThis Holley EFI injector harness is built for Ford V8 engines running USCAR\/EV6 style fuel injectors in an evenly spaced configuration, giving a clean, direct-fit wiring connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eType: Injector harness, evenly spaced\u003c\/li\u003e\n\u003cli\u003eInjector Style: USCAR\/EV6\u003c\/li\u003e\n\u003cli\u003eHarness Application: Ford\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-212\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat injector style is this harness built for?\u003c\/h5\u003e\u003cp\u003eIt's designed for USCAR\/EV6 style fuel injectors.\u003c\/p\u003e\u003ch5\u003eWhat engine layout is this harness for?\u003c\/h5\u003e\u003cp\u003eIt's built for Ford V8 engines with an evenly spaced injector layout.\u003c\/p\u003e\u003ch5\u003eIs this harness Ford-specific?\u003c\/h5\u003e\u003cp\u003eYes, it's designed specifically for Ford applications using USCAR\/EV6 injectors.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What injector style is this harness built for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for USCAR\/EV6 style fuel injectors.\"}},{\"@type\":\"Question\",\"name\":\"What engine layout is this harness for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for Ford V8 engines with an evenly spaced injector layout.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness Ford-specific?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it's designed specifically for Ford applications using USCAR\/EV6 injectors.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418594873392,"sku":"GVMR_558-212","price":207.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-212_20_1.jpg?v=1758386348"},{"product_id":"gm-tpi-and-stealth-ram-efi-harness-kit-558-503","title":"Holley GM TPI\/Stealth Ram EFI Harness Kit, Bosch Injector Connector, CD Ignition | 558-503","description":"\u003cp\u003eThis Holley EFI harness kit is built for GM TPI and Stealth Ram applications, supplying the clean, constant voltage and solid grounds an EFI system depends on. The kit bundles the main harness, power harness, and injector harness needed to support a primary GM TPI\/Stealth Ram EFI system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: GM TPI and Stealth Ram\u003c\/li\u003e\n\u003cli\u003eIgnition Type: CD Ignition (No Timing Control)\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch)\u003c\/li\u003e\n\u003cli\u003eProduct Type: Harness Kit\u003c\/li\u003e\n\u003cli\u003eIncludes: Stealthram\/TPI Main Harness, Main Power Harness, V8 Injector Harness, HEI Ignition Harness, Ignition Adapter, and Tach Input\u003c\/li\u003e\n\u003cli\u003eCompatible with Dominator and HP ECUs\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-503\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eA separate ECU and O2 sensor are required to complete this kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat GM applications does the 558-503 harness kit fit?\u003c\/h5\u003e\u003cp\u003eIt's built for GM TPI and Holley Stealth Ram EFI setups using CD ignition (no timing control) and Bosch Jetronic\/Minitimer style injector connectors.\u003c\/p\u003e\u003ch5\u003eWhat's included in the kit?\u003c\/h5\u003e\u003cp\u003eThe kit includes the Stealthram\/TPI main harness, main power harness, V8 injector harness, HEI ignition harness, ignition adapter, and tach input.\u003c\/p\u003e\u003ch5\u003eDo I need anything else to complete the system?\u003c\/h5\u003e\u003cp\u003eYes, a separate ECU and O2 sensor are required to make this a complete, running EFI system.\u003c\/p\u003e\u003ch5\u003eIs this harness compliant for street use?\u003c\/h5\u003e\u003cp\u003eNo. It's legal for Racing Use Only vehicles and cannot be installed on an emissions-controlled street vehicle.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What GM applications does the 558-503 harness kit fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for GM TPI and Holley Stealth Ram EFI setups using CD ignition (no timing control) and Bosch Jetronic\/Minitimer style injector connectors.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The kit includes the Stealthram\/TPI main harness, main power harness, V8 injector harness, HEI ignition harness, ignition adapter, and tach input.\"}},{\"@type\":\"Question\",\"name\":\"Do I need anything else to complete the system?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a separate ECU and O2 sensor are required to make this a complete, running EFI system.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness compliant for street use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It's legal for Racing Use Only vehicles and cannot be installed on an emissions-controlled street vehicle.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418595070000,"sku":"GVMR_558-503","price":899.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-503_01.jpg?v=1758386371"},{"product_id":"gm-ls2-ls3-ls7-58x-crank-sensor-bosch-injector-558-502","title":"Holley GM LS2\/LS3\/LS7 58X EFI Harness Kit, Bosch Injector Connector | 558-502","description":"\u003cp\u003eThis Holley EFI harness kit is designed for GM LS2\/LS3\/LS7 engines with 58X crank sensors, supplying the clean, constant voltage and solid grounds an EFI system depends on. The kit bundles the main power harness, LS2 main harness, and V8 injector harness needed to support a primary LS EFI system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: GM LSX (LS2\/LS3\/LS7)\u003c\/li\u003e\n\u003cli\u003eCrank Sensor: 58X\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch)\u003c\/li\u003e\n\u003cli\u003eProduct Type: Harness Kit\u003c\/li\u003e\n\u003cli\u003eIncludes: Main Power Harness, LS2 Main Harness, V-8 Injector Harness\u003c\/li\u003e\n\u003cli\u003eCompatible with HP and Dominator ECUs\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-502\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eA separate ECU and O2 sensor are required to complete this kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. 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It's designed for use with HP EFI and Dominator EFI systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: Universal\u003c\/li\u003e\n\u003cli\u003eHarness Type: Injector\u003c\/li\u003e\n\u003cli\u003eInjector Count: 16\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Bosch EV1-style\u003c\/li\u003e\n\u003cli\u003eProduct Type: Universal Unterminated Injector Harness\u003c\/li\u003e\n\u003cli\u003eIncludes: All connectors, pins, terminals, and loom needed\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-207\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eHarness must be assembled by the installer and requires crimping Metripack150 connectors on the unterminated end.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat systems is the 558-207 harness designed for?\u003c\/h5\u003e\u003cp\u003eIt's designed for use with Holley HP EFI and Dominator EFI systems supporting up to 16 injectors.\u003c\/p\u003e\u003ch5\u003eIs this harness ready to install out of the box?\u003c\/h5\u003e\u003cp\u003eNo. It's unterminated on the main harness side and must be assembled, which requires crimping Metripack150 connectors.\u003c\/p\u003e\u003ch5\u003eWhat connector style is used at the injectors?\u003c\/h5\u003e\u003cp\u003eThe injector-side connectors are terminated in Bosch EV1 style.\u003c\/p\u003e\u003ch5\u003eWhat's included with the harness?\u003c\/h5\u003e\u003cp\u003eAll connectors, pins, terminals, and loom needed for assembly are included.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What systems is the 558-207 harness designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for use with Holley HP EFI and Dominator EFI systems supporting up to 16 injectors.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness ready to install out of the box?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It's unterminated on the main harness side and must be assembled, which requires crimping Metripack150 connectors.\"}},{\"@type\":\"Question\",\"name\":\"What connector style is used at the injectors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The injector-side connectors are terminated in Bosch EV1 style.\"}},{\"@type\":\"Question\",\"name\":\"What's included with the harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"All connectors, pins, terminals, and loom needed for assembly are included.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418595201072,"sku":"GVMR_558-207","price":207.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-207_02.jpg?v=1758386386"},{"product_id":"gm-ls1-6-24x-crank-sensor-bosch-injector-558-500","title":"Holley GM LS1\/LS6 24X EFI Harness Kit, Bosch Injector Connector | 558-500","description":"\u003cp\u003eThis Holley EFI harness kit is designed for GM LS1\/LS6 engines with 24X crank sensors, supplying the clean, constant voltage and solid grounds an EFI system depends on. The kit bundles the main power harness, LS1 main harness, and V8 injector harness needed to support a primary LS EFI system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: GM LSX (LS1\/LS6)\u003c\/li\u003e\n\u003cli\u003eCrank Sensor: 24X\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch)\u003c\/li\u003e\n\u003cli\u003eProduct Type: Harness Kit\u003c\/li\u003e\n\u003cli\u003eIncludes: Main Power Harness, LS1 Main Harness, V-8 Injector Harness\u003c\/li\u003e\n\u003cli\u003eCompatible with HP and Dominator ECUs\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-500\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eA separate ECU and O2 sensor are required to complete this kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does the 558-500 harness kit fit?\u003c\/h5\u003e\u003cp\u003eIt's built for GM LS1 and LS6 engines equipped with a 24X crank sensor and Bosch injector connectors.\u003c\/p\u003e\u003ch5\u003eWhat's included in the kit?\u003c\/h5\u003e\u003cp\u003eThe kit includes the main power harness, LS1 main harness, and V-8 injector harness.\u003c\/p\u003e\u003ch5\u003eDo I need anything else to complete the system?\u003c\/h5\u003e\u003cp\u003eYes, a separate ECU and O2 sensor are required to make this a complete, running EFI system.\u003c\/p\u003e\u003ch5\u003eIs this harness compliant for street use?\u003c\/h5\u003e\u003cp\u003eNo. It's legal for Racing Use Only vehicles and cannot be installed on an emissions-controlled street vehicle.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does the 558-500 harness kit fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for GM LS1 and LS6 engines equipped with a 24X crank sensor and Bosch injector connectors.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The kit includes the main power harness, LS1 main harness, and V-8 injector harness.\"}},{\"@type\":\"Question\",\"name\":\"Do I need anything else to complete the system?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a separate ECU and O2 sensor are required to make this a complete, running EFI system.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness compliant for street use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It's legal for Racing Use Only vehicles and cannot be installed on an emissions-controlled street vehicle.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418595266608,"sku":"GVMR_558-500","price":1065.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-500.jpg?v=1758386393"},{"product_id":"universal-4-cylinder-ev14-injector-harness-for-hp-efi-dominator-efi-558-440","title":"Holley Universal 4-Cylinder EV14 Injector Harness, For HP EFI \u0026 Dominator EFI | 558-440","description":"\u003cp\u003eThis universal 4-cylinder EV14 injector harness is designed to be plug-and-play with Holley HP EFI and Dominator EFI systems, built for use with Holley's 205 lb\/hr injector set.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: Universal\u003c\/li\u003e\n\u003cli\u003eHarness Type: Injector\u003c\/li\u003e\n\u003cli\u003eCylinder Count: 4\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Bosch\/EV14\u003c\/li\u003e\n\u003cli\u003eProduct Type: Injector Harness - Connector\u003c\/li\u003e\n\u003cli\u003eDesigned for use with 205 lb\/hr Injector Set (Part Number 522-205)\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-440\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat injector set is the 558-440 harness designed for?\u003c\/h5\u003e\u003cp\u003eIt's designed to be plug-and-play with Holley's 205 lb\/hr injector set, Part Number 522-205.\u003c\/p\u003e\u003ch5\u003eWhat ECUs does this harness work with?\u003c\/h5\u003e\u003cp\u003eIt's built for use with HP EFI and Dominator EFI systems.\u003c\/p\u003e\u003ch5\u003eWhat connector style does it use?\u003c\/h5\u003e\u003cp\u003eIt uses Bosch\/EV14 style injector connectors on a 4-cylinder harness.\u003c\/p\u003e\u003ch5\u003eIs this harness a direct plug-and-play install?\u003c\/h5\u003e\u003cp\u003eYes, it's designed as a plug-and-play harness for the specified injector set and ECU applications.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What injector set is the 558-440 harness designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed to be plug-and-play with Holley's 205 lb\/hr injector set, Part Number 522-205.\"}},{\"@type\":\"Question\",\"name\":\"What ECUs does this harness work with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for use with HP EFI and Dominator EFI systems.\"}},{\"@type\":\"Question\",\"name\":\"What connector style does it use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It uses Bosch\/EV14 style injector connectors on a 4-cylinder harness.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness a direct plug-and-play install?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it's designed as a plug-and-play harness for the specified injector set and ECU applications.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418595332144,"sku":"GVMR_558-440","price":126.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-440_02.jpg?v=1758386400"},{"product_id":"injector-upgrade-harness-for-terminator-throttle-bodies-558-439","title":"Holley Terminator Throttle Body Injector Upgrade Harness, 205 lb\/hr Kit | 558-439","description":"\u003cp\u003eThis injector upgrade harness is designed for Terminator throttle body systems, built to be plug-and-play with Holley's 205 lb\/hr injector upgrade kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: Terminator Throttle Body Harness\u003c\/li\u003e\n\u003cli\u003eDesigned for use with 205 lb\/hr Injector Upgrade Kit (Part Number 522-205)\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-439\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNote: This harness does NOT fit the Terminator Stealth Throttle Body.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat is the 558-439 harness designed for?\u003c\/h5\u003e\u003cp\u003eIt's an injector upgrade harness built to be plug-and-play with Holley's 205 lb\/hr injector upgrade kit, Part Number 522-205, on Terminator throttle body systems.\u003c\/p\u003e\u003ch5\u003eDoes this harness fit the Terminator Stealth Throttle Body?\u003c\/h5\u003e\u003cp\u003eNo, this harness does not fit the Terminator Stealth Throttle Body.\u003c\/p\u003e\u003ch5\u003eIs this harness street legal?\u003c\/h5\u003e\u003cp\u003eNo. It's legal for Racing Use Only vehicles and cannot be installed on an emissions-controlled street vehicle.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is the 558-439 harness designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's an injector upgrade harness built to be plug-and-play with Holley's 205 lb\/hr injector upgrade kit, Part Number 522-205, on Terminator throttle body systems.\"}},{\"@type\":\"Question\",\"name\":\"Does this harness fit the Terminator Stealth Throttle Body?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this harness does not fit the Terminator Stealth Throttle Body.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness street legal?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It's legal for Racing Use Only vehicles and cannot be installed on an emissions-controlled street vehicle.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418595397680,"sku":"GVMR_558-439","price":265.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-439_01.jpg?v=1758386409"},{"product_id":"gm-ls2-ls3-ls7-58x-crank-sensor-uscar-ev6-injector-558-501","title":"Holley GM LS2\/LS3\/LS7 Harness Kit, 58X Crank Sensor, USCAR\/EV6 Injector | 558-501","description":"\u003cp\u003eAn EFI system depends on a clean, constant voltage source, and grounds are just as important as the power side. This Holley harness kit includes the main harness, power harness, and injector harness needed to support your primary GM LS2\/LS3\/LS7 system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: LSX\u003c\/li\u003e\n\u003cli\u003eCrank Sensor: 58X\u003c\/li\u003e\n\u003cli\u003eInjector Connector: USCAR (EV6)\u003c\/li\u003e\n\u003cli\u003eIncludes: Main Power Harness, LS2 Main Harness, LSX Injector Harness\u003c\/li\u003e\n\u003cli\u003eProduct Type: Harness Kit\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-501\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWorks with Dominator and HP ECUs. You will need to purchase a compatible ECU and O2 sensor separately to complete the kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eDoes the Holley 558-501 harness kit include an ECU?\u003c\/h5\u003e\u003cp\u003eNo, you'll need to purchase a compatible ECU (Dominator or HP) and an oxygen sensor separately.\u003c\/p\u003e\u003ch5\u003eWhat crank sensor and injector style does this harness support?\u003c\/h5\u003e\u003cp\u003eA 58X crank sensor and USCAR\/EV6 injector connectors.\u003c\/p\u003e\u003ch5\u003eWhat's included in the kit?\u003c\/h5\u003e\u003cp\u003eA main power harness, LS2 main harness, and LSX injector harness.\u003c\/p\u003e\u003ch5\u003eWhat engines is this designed for?\u003c\/h5\u003e\u003cp\u003eGM LS2, LS3, and LS7 applications.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does the Holley 558-501 harness kit include an ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, you'll need to purchase a compatible ECU (Dominator or HP) and an oxygen sensor separately.\"}},{\"@type\":\"Question\",\"name\":\"What crank sensor and injector style does this harness support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A 58X crank sensor and USCAR\/EV6 injector connectors.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A main power harness, LS2 main harness, and LSX injector harness.\"}},{\"@type\":\"Question\",\"name\":\"What engines is this designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"GM LS2, LS3, and LS7 applications.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418603327536,"sku":"GVMR_558-501","price":949.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-501.jpg?v=1758387078"},{"product_id":"universal-ford-v8-bosch-injector-558-508","title":"Holley Universal Ford V8 Harness Kit, Bosch Injector, HP\/Dominator ECU | 558-508","description":"\u003cp\u003eAn EFI system depends on a clean, constant voltage source, and grounds are just as important as the power side. This Holley harness kit includes the main harness, power harness, and injector harness needed to support your primary Ford V8 system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: Ford\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch)\u003c\/li\u003e\n\u003cli\u003eIncludes: Main power harness, universal MPFI main harness, Ford V8 injector harness, ignition adapter, tachometer input\u003c\/li\u003e\n\u003cli\u003eProduct Type: Harness Kit\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-508\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWorks with Dominator or HP ECUs. To complete your installation, add a Holley ECU and a compatible oxygen sensor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eDoes this harness kit include an ECU?\u003c\/h5\u003e\u003cp\u003eNo, it's designed to pair with a Holley HP or Dominator ECU and a compatible oxygen sensor, both sold separately.\u003c\/p\u003e\u003ch5\u003eWhat injector style does it support?\u003c\/h5\u003e\u003cp\u003eBosch (Jetronic\/Minitimer) style injectors.\u003c\/p\u003e\u003ch5\u003eWhat's included?\u003c\/h5\u003e\u003cp\u003eMain power harness, universal MPFI main harness, Ford V8 injector harness, ignition adapter, and tachometer input.\u003c\/p\u003e\u003ch5\u003eWhich ECUs is it compatible with?\u003c\/h5\u003e\u003cp\u003eHolley Dominator and HP EFI ECUs.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does this harness kit include an ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, it's designed to pair with a Holley HP or Dominator ECU and a compatible oxygen sensor, both sold separately.\"}},{\"@type\":\"Question\",\"name\":\"What injector style does it support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Bosch (Jetronic\/Minitimer) style injectors.\"}},{\"@type\":\"Question\",\"name\":\"What's included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Main power harness, universal MPFI main harness, Ford V8 injector harness, ignition adapter, and tachometer input.\"}},{\"@type\":\"Question\",\"name\":\"Which ECUs is it compatible with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Holley Dominator and HP EFI ECUs.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418603655216,"sku":"GVMR_558-508","price":552.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-508.jpg?v=1758387086"},{"product_id":"hp-efi-ecu-and-harness-kits-550-617","title":"Holley HP EFI ECU \u0026 Harness Kit, Ford 4V Modular, Bosch O2 Sensor | 550-617","description":"\u003cp\u003eLooking for a plug-and-play kit for a Ford Modular engine? This HP ECU accurately manages fuel and ignition for wild cams, power adders, and more, without relying on a MAF sensor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned specifically for 1999-2004 Ford Modular 4-Valve engines\u003c\/li\u003e\n\u003cli\u003ePlug and play with factory sensors: crank, cam, TPS, coolant temp, and more\u003c\/li\u003e\n\u003cli\u003ePlug and play with factory actuators: coils, injectors, IAC\u003c\/li\u003e\n\u003cli\u003eConnectors for Holley fuel pressure and oil pressure sensors\u003c\/li\u003e\n\u003cli\u003eConnectors for expanded inputs and outputs\u003c\/li\u003e\n\u003cli\u003eComplete plug-and-play kit includes HP ECU, Bosch wideband oxygen sensor, MAP sensor, coil drivers, and all necessary harnesses\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs support boost control, progressive nitrous, water\/meth injection, speed inputs, fuel pump control, A\/C inputs, timing retard, and more\u003c\/li\u003e\n\u003cli\u003eFree software and firmware updates available for download\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: Ford Mod Motor\u003c\/li\u003e\n\u003cli\u003eIgnition Type: 4V Ford Modular\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch)\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: Bosch\u003c\/li\u003e\n\u003cli\u003eProduct Type: HP EFI Kit\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-617\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eComplete 1999-2004 4-Valve Ford Modular engine plug-and-play kit with Jetronic \"Bosch style\" injector harness.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engine does the Holley 550-617 kit fit?\u003c\/h5\u003e\u003cp\u003e1999-2004 Ford Modular 4-Valve engines.\u003c\/p\u003e\u003ch5\u003eIs this a plug-and-play kit?\u003c\/h5\u003e\u003cp\u003eYes, it plugs into factory sensors (crank, cam, TPS, coolant temp) and actuators (coils, injectors, IAC).\u003c\/p\u003e\u003ch5\u003eWhat's included?\u003c\/h5\u003e\u003cp\u003eThe HP ECU, Bosch wideband oxygen sensor, MAP sensor, coil drivers, and all necessary harnesses.\u003c\/p\u003e\u003ch5\u003eCan it control nitrous or boost?\u003c\/h5\u003e\u003cp\u003eYes, its 4 programmable inputs and outputs support boost control, progressive nitrous, water\/meth injection, and more.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engine does the Holley 550-617 kit fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"1999-2004 Ford Modular 4-Valve engines.\"}},{\"@type\":\"Question\",\"name\":\"Is this a plug-and-play kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it plugs into factory sensors (crank, cam, TPS, coolant temp) and actuators (coils, injectors, IAC).\"}},{\"@type\":\"Question\",\"name\":\"What's included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The HP ECU, Bosch wideband oxygen sensor, MAP sensor, coil drivers, and all necessary harnesses.\"}},{\"@type\":\"Question\",\"name\":\"Can it control nitrous or boost?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, its 4 programmable inputs and outputs support boost control, progressive nitrous, water\/meth injection, and more.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418604048432,"sku":"GVMR_550-617","price":3299.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-617_02.jpg?v=1758387093"},{"product_id":"hp-efi-ecu-and-harness-kits-550-616n","title":"Holley HP EFI ECU \u0026 Harness Kit, Ford 2V Modular, NTK Oxygen Sensor | 550-616N","description":"\u003cp\u003eLooking for a plug-and-play kit for a Ford Modular engine? This HP ECU accurately manages fuel and ignition for wild cams, power adders, and more, without relying on a MAF sensor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned specifically for 1999-2004 Ford Modular 2-Valve engines\u003c\/li\u003e\n\u003cli\u003ePlug and play with factory sensors: crank, cam, TPS, coolant temp, and more\u003c\/li\u003e\n\u003cli\u003ePlug and play with factory actuators: coils, injectors, IAC\u003c\/li\u003e\n\u003cli\u003eConnectors for Holley fuel pressure and oil pressure sensors\u003c\/li\u003e\n\u003cli\u003eConnectors for expanded inputs and outputs\u003c\/li\u003e\n\u003cli\u003eComplete plug-and-play kit includes HP ECU, NTK oxygen sensor, MAP sensor, coil drivers, and all necessary harnesses\u003c\/li\u003e\n\u003cli\u003eNTK oxygen sensor is recommended when using leaded or methanol fuels, high exhaust applications, forced induction, or for the highest precision feedback\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs support boost control, progressive nitrous, water\/meth injection, speed inputs, fuel pump control, A\/C inputs, timing retard, and more\u003c\/li\u003e\n\u003cli\u003eFree software and firmware updates available for download\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: Ford Mod Motor\u003c\/li\u003e\n\u003cli\u003eIgnition Type: 2V Ford Modular\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch)\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: NTK\u003c\/li\u003e\n\u003cli\u003eProduct Type: HP EFI Kit\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-616N\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eComplete 1999-2004 2-Valve Ford Modular engine plug-and-play kit with Jetronic \"Bosch style\" injector harness.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engine does the Holley 550-616N kit fit?\u003c\/h5\u003e\u003cp\u003e1999-2004 Ford Modular 2-Valve engines.\u003c\/p\u003e\u003ch5\u003eWhy would I choose the NTK oxygen sensor version?\u003c\/h5\u003e\u003cp\u003eNTK is recommended when running leaded or methanol fuels, high exhaust or forced induction applications, or when you want the highest precision feedback.\u003c\/p\u003e\u003ch5\u003eIs this a plug-and-play kit?\u003c\/h5\u003e\u003cp\u003eYes, it plugs into factory sensors (crank, cam, TPS, coolant temp) and actuators (coils, injectors, IAC).\u003c\/p\u003e\u003ch5\u003eCan it control nitrous or boost?\u003c\/h5\u003e\u003cp\u003eYes, its 4 programmable inputs and outputs support boost control, progressive nitrous, water\/meth injection, and more.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engine does the Holley 550-616N kit fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"1999-2004 Ford Modular 2-Valve engines.\"}},{\"@type\":\"Question\",\"name\":\"Why would I choose the NTK oxygen sensor version?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"NTK is recommended when running leaded or methanol fuels, high exhaust or forced induction applications, or when you want the highest precision feedback.\"}},{\"@type\":\"Question\",\"name\":\"Is this a plug-and-play kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it plugs into factory sensors (crank, cam, TPS, coolant temp) and actuators (coils, injectors, IAC).\"}},{\"@type\":\"Question\",\"name\":\"Can it control nitrous or boost?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, its 4 programmable inputs and outputs support boost control, progressive nitrous, water\/meth injection, and more.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418604376112,"sku":"GVMR_550-616N","price":3016.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-616N_01.jpg?v=1758387100"},{"product_id":"hp-efi-ecu-harness-kits-550-616","title":"Holley HP EFI ECU \u0026 Harness Kit, Ford 2V Modular, Bosch Oxygen Sensor | 550-616","description":"\u003cp\u003eLooking for a plug-and-play kit for a Ford Modular engine? This HP ECU accurately manages fuel and ignition for wild cams, power adders, and more, without relying on a MAF sensor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned specifically for 1999-2004 Ford Modular 2-Valve engines\u003c\/li\u003e\n\u003cli\u003ePlug and play with factory sensors: crank, cam, TPS, coolant temp, and more\u003c\/li\u003e\n\u003cli\u003ePlug and play with factory actuators: coils, injectors, IAC\u003c\/li\u003e\n\u003cli\u003eConnectors for Holley fuel pressure and oil pressure sensors\u003c\/li\u003e\n\u003cli\u003eConnectors for expanded inputs and outputs\u003c\/li\u003e\n\u003cli\u003eComplete plug-and-play kit includes HP ECU, Bosch wideband oxygen sensor, MAP sensor, coil drivers, and all necessary harnesses\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs support boost control, progressive nitrous, water\/meth injection, speed inputs, fuel pump control, A\/C inputs, timing retard, and more\u003c\/li\u003e\n\u003cli\u003eFree software and firmware updates available for download\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: Ford Mod Motor\u003c\/li\u003e\n\u003cli\u003eIgnition Type: 2V Ford Modular\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch)\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: Bosch\u003c\/li\u003e\n\u003cli\u003eProduct Type: HP EFI Kit\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-616\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eComplete 1999-2004 2-Valve Ford Modular engine plug-and-play kit with Jetronic \"Bosch style\" injector harness. ECU is certified to ISO 8846, SAE J1171, and United States Coast Guard requirements for ignition protection and fire resistance.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engine does the Holley 550-616 kit fit?\u003c\/h5\u003e\u003cp\u003e1999-2004 Ford Modular 2-Valve engines.\u003c\/p\u003e\u003ch5\u003eIs this a plug-and-play kit?\u003c\/h5\u003e\u003cp\u003eYes, it plugs into factory sensors (crank, cam, TPS, coolant temp) and actuators (coils, injectors, IAC).\u003c\/p\u003e\u003ch5\u003eWhat's included?\u003c\/h5\u003e\u003cp\u003eThe HP ECU, Bosch wideband oxygen sensor, MAP sensor, coil drivers, and all necessary harnesses.\u003c\/p\u003e\u003ch5\u003eCan it control nitrous or boost?\u003c\/h5\u003e\u003cp\u003eYes, its 4 programmable inputs and outputs support boost control, progressive nitrous, water\/meth injection, and more.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engine does the Holley 550-616 kit fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"1999-2004 Ford Modular 2-Valve engines.\"}},{\"@type\":\"Question\",\"name\":\"Is this a plug-and-play kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it plugs into factory sensors (crank, cam, TPS, coolant temp) and actuators (coils, injectors, IAC).\"}},{\"@type\":\"Question\",\"name\":\"What's included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The HP ECU, Bosch wideband oxygen sensor, MAP sensor, coil drivers, and all necessary harnesses.\"}},{\"@type\":\"Question\",\"name\":\"Can it control nitrous or boost?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, its 4 programmable inputs and outputs support boost control, progressive nitrous, water\/meth injection, and more.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418604769328,"sku":"GVMR_550-616","price":2803.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-616small.jpg?v=1758387106"},{"product_id":"evenly-spaced-ford-v8-injector-harness-for-jetronic-bosch-ev1-style-injectors-558-213","title":"Holley Ford V8 Injector Harness, Evenly Spaced, Jetronic Bosch EV1 Style | 558-213","description":"\u003cp\u003eThis Ford V8 injector harness is built for Jetronic \"Bosch\" style fuel injectors with evenly spaced connectors, giving builders a clean way to wire up their injector bank.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: Ford\u003c\/li\u003e\n\u003cli\u003eHarness Type: Injector\u003c\/li\u003e\n\u003cli\u003eInjector Style: Jetronic \"Bosch EV1\"\u003c\/li\u003e\n\u003cli\u003eSpacing: Evenly spaced\u003c\/li\u003e\n\u003cli\u003eProduct Type: Ford EV1 Style Injector Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-213\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat injector style is this harness designed for?\u003c\/h5\u003e\u003cp\u003eJetronic \"Bosch EV1\" style fuel injectors.\u003c\/p\u003e\u003ch5\u003eWhat spacing configuration does this harness use?\u003c\/h5\u003e\u003cp\u003eEvenly spaced connectors for Ford V8 applications.\u003c\/p\u003e\u003ch5\u003eIs this a standalone harness or part of a full kit?\u003c\/h5\u003e\u003cp\u003eIt's a standalone injector harness intended for use with a Holley EFI ECU and main harness.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What injector style is this harness designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Jetronic Bosch EV1 style fuel injectors.\"}},{\"@type\":\"Question\",\"name\":\"What spacing configuration does this harness use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Evenly spaced connectors for Ford V8 applications.\"}},{\"@type\":\"Question\",\"name\":\"Is this a standalone harness or part of a full kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's a standalone injector harness intended for use with a Holley EFI ECU and main harness.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418605162544,"sku":"GVMR_558-213","price":212.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-213_01.jpg?v=1758387115"},{"product_id":"1999-2004-ford-modular-2-valve-harness-kit-558-505","title":"Holley Ford Modular 2 Valve EFI Harness Kit, 1999-2004 | 558-505","description":"\u003cp\u003eThis wiring harness interfaces a Holley EFI ECU to a 1999-2004 2-Valve Ford Modular engine, using most stock sensors and pairing with an injector harness, coil harness, and ignition modules.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: Ford\u003c\/li\u003e\n\u003cli\u003eIgnition Type: 2V Ford Modular\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch)\u003c\/li\u003e\n\u003cli\u003eIncludes: Main Power Harness, Ford Modular Main Harness, Ford V8 Injector Harness, Ford Modular 2V Coil Harness, Coil Drivers\u003c\/li\u003e\n\u003cli\u003eProduct Type: Harness Kit\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-505\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis kit is meant to be used in conjunction with an injector harness, coil harness, and ignition modules. You'll need to purchase an ECU and O2 sensor separately to complete the kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat years\/engines does the 558-505 harness kit fit?\u003c\/h5\u003e\u003cp\u003e1999-2004 Ford Modular 2-Valve engines.\u003c\/p\u003e\u003ch5\u003eDoes it include an ECU or oxygen sensor?\u003c\/h5\u003e\u003cp\u003eNo, you'll need to add a compatible ECU and O2 sensor separately.\u003c\/p\u003e\u003ch5\u003eWhat else do I need to complete the installation?\u003c\/h5\u003e\u003cp\u003eAn injector harness, coil harness, and ignition modules.\u003c\/p\u003e\u003ch5\u003eWhat's included in the kit?\u003c\/h5\u003e\u003cp\u003eMain power harness, Ford Modular main harness, Ford V8 injector harness, Ford Modular 2V coil harness, and coil drivers.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What years\/engines does the 558-505 harness kit fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"1999-2004 Ford Modular 2-Valve engines.\"}},{\"@type\":\"Question\",\"name\":\"Does it include an ECU or oxygen sensor?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, you'll need to add a compatible ECU and O2 sensor separately.\"}},{\"@type\":\"Question\",\"name\":\"What else do I need to complete the installation?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"An injector harness, coil harness, and ignition modules.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Main power harness, Ford Modular main harness, Ford V8 injector harness, Ford Modular 2V coil harness, and coil drivers.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418605359152,"sku":"GVMR_558-505","price":1358.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-505_01.jpg?v=1758387122"},{"product_id":"universal-v8-mpfi-efi-harness-kit-558-504","title":"Holley Universal V8 MPFI EFI Harness Kit, Ford\/GM, Bosch Injector | 558-504","description":"\u003cp\u003eAn EFI system depends on a clean, constant voltage source, and grounds are just as important as the power side. This universal Holley harness kit includes the main harness, power harness, and injector harness needed to support your primary V8 MPFI system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarness Application: Ford, GM, Universal\u003c\/li\u003e\n\u003cli\u003eIgnition Type: CD Ignition (No Timing Control)\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch)\u003c\/li\u003e\n\u003cli\u003eIncludes: Main power harness, MPFI main harness, V8 injector harness\u003c\/li\u003e\n\u003cli\u003eProduct Type: Harness Kit\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-504\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWorks with Dominator and HP ECUs. To complete your installation, add a Holley ECU and a compatible oxygen sensor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat vehicles is the 558-504 harness kit compatible with?\u003c\/h5\u003e\u003cp\u003eIt's a universal harness for Ford, GM, and other V8 MPFI applications.\u003c\/p\u003e\u003ch5\u003eDoes it include an ECU?\u003c\/h5\u003e\u003cp\u003eNo, pair it with a compatible Holley ECU and oxygen sensor, both sold separately.\u003c\/p\u003e\u003ch5\u003eWhat ignition type does it support?\u003c\/h5\u003e\u003cp\u003eCD ignition with no timing control.\u003c\/p\u003e\u003ch5\u003eWhat's included?\u003c\/h5\u003e\u003cp\u003eMain power harness, MPFI main harness, and V8 injector harness.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What vehicles is the 558-504 harness kit compatible with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's a universal harness for Ford, GM, and other V8 MPFI applications.\"}},{\"@type\":\"Question\",\"name\":\"Does it include an ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, pair it with a compatible Holley ECU and oxygen sensor, both sold separately.\"}},{\"@type\":\"Question\",\"name\":\"What ignition type does it support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"CD ignition with no timing control.\"}},{\"@type\":\"Question\",\"name\":\"What's included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Main power harness, MPFI main harness, and V8 injector harness.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418605424688,"sku":"GVMR_558-504","price":899.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-504.jpg?v=1758387129"},{"product_id":"ford-7-3l-godzilla-main-harness-for-stock-coils-558-140","title":"Holley Terminator X Ford 7.3L Godzilla Main Harness, Stock Coils | 558-140","description":"\u003cp\u003eThis Terminator X main harness is built for the Ford 7.3L Godzilla engine, offering plug-and-play installation with labeled connectors and protective wire sleeving. It's designed for stock coil setups and works alongside the Terminator X's fuel, ignition, and data-logging control.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine\/Platform: Ford 7.3L Godzilla\u003c\/li\u003e\n\u003cli\u003eCoil Configuration: Stock coils, includes VVT and oil pump connectors\u003c\/li\u003e\n\u003cli\u003eHarness Type: Main\u003c\/li\u003e\n\u003cli\u003eHarness Application: Ford\u003c\/li\u003e\n\u003cli\u003eWarning: California Proposition 65\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-140\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eRequires Holley crank sensor module 558-474 for proper operation with stock coils.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engine is the 558-140 harness for?\u003c\/h5\u003e\u003cp\u003eThe Ford 7.3L Godzilla engine, for use with a Terminator X ECU.\u003c\/p\u003e\u003ch5\u003eDoes this harness work with stock or aftermarket coils?\u003c\/h5\u003e\u003cp\u003eIt's built for stock coils; a separate harness (558-141) covers IGN1A smart coils.\u003c\/p\u003e\u003ch5\u003eWhat else do I need for proper operation?\u003c\/h5\u003e\u003cp\u003eHolley's crank sensor module, part number 558-474.\u003c\/p\u003e\u003ch5\u003eDoes this harness include VVT connectors?\u003c\/h5\u003e\u003cp\u003eYes, it includes VVT and oil pump connectors.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engine is the 558-140 harness for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Ford 7.3L Godzilla engine, for use with a Terminator X ECU.\"}},{\"@type\":\"Question\",\"name\":\"Does this harness work with stock or aftermarket coils?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for stock coils; a separate harness (558-141) covers IGN1A smart coils.\"}},{\"@type\":\"Question\",\"name\":\"What else do I need for proper operation?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Holley's crank sensor module, part number 558-474.\"}},{\"@type\":\"Question\",\"name\":\"Does this harness include VVT connectors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes VVT and oil pump connectors.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418643730480,"sku":"GVMR_558-140","price":519.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/2a1de422dcc15ef6cca70db8a9384fa0b2d06ba2.jpg?v=1758389490"},{"product_id":"ford-7-3l-godzilla-main-harness-for-smart-coils-558-141","title":"Holley Terminator X Ford 7.3L Godzilla Main Harness, IGN1A Smart Coils | 558-141","description":"\u003cp\u003eThis Terminator X main harness is built for the Ford 7.3L Godzilla engine, offering plug-and-play installation with labeled connectors and protective wire sleeving. It's configured for IGN1A smart coil setups and works alongside the Terminator X's fuel, ignition, and data-logging control.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine\/Platform: Ford 7.3L Godzilla\u003c\/li\u003e\n\u003cli\u003eCoil Configuration: IGN1A Smart Coils, includes VVT and oil pump connectors\u003c\/li\u003e\n\u003cli\u003eHarness Type: Main\u003c\/li\u003e\n\u003cli\u003eHarness Application: Ford\u003c\/li\u003e\n\u003cli\u003eWarning: California Proposition 65\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-141\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eRequires Holley crank sensor module 558-474 for proper operation with smart coils.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engine is the 558-141 harness for?\u003c\/h5\u003e\u003cp\u003eThe Ford 7.3L Godzilla engine, for use with a Terminator X ECU.\u003c\/p\u003e\u003ch5\u003eDoes this harness work with stock or aftermarket coils?\u003c\/h5\u003e\u003cp\u003eIt's configured for IGN1A smart coils; a separate harness (558-140) covers stock coils.\u003c\/p\u003e\u003ch5\u003eWhat else do I need for proper operation?\u003c\/h5\u003e\u003cp\u003eHolley's crank sensor module, part number 558-474.\u003c\/p\u003e\u003ch5\u003eDoes this harness include VVT connectors?\u003c\/h5\u003e\u003cp\u003eYes, it includes VVT and oil pump connectors.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engine is the 558-141 harness for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Ford 7.3L Godzilla engine, for use with a Terminator X ECU.\"}},{\"@type\":\"Question\",\"name\":\"Does this harness work with stock or aftermarket coils?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's configured for IGN1A smart coils; a separate harness (558-140) covers stock coils.\"}},{\"@type\":\"Question\",\"name\":\"What else do I need for proper operation?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Holley's crank sensor module, part number 558-474.\"}},{\"@type\":\"Question\",\"name\":\"Does this harness include VVT connectors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes VVT and oil pump connectors.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418643828784,"sku":"GVMR_558-141","price":531.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/ccadf10f671f20710c53dccc146c3de32cd14cb5.jpg?v=1758389498"},{"product_id":"holley-efi-gm-gen-v-gdi-subharness-558-220","title":"Holley GM Gen V GDI Sub Harness, Early LTx 4-Pin Fuel Pressure Sensor | 558-220","description":"\u003cp\u003eThis GDI sub harness connects the GM Gen V GDI controller to early LTx-engine fuel injectors. Early engines are identified by a 4-pin fuel pressure sensor mounted to the back of the driver-side fuel rail; GM used two different sensor styles across the Gen V LTx engine family, so confirm which one your engine has before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine\/Platform: Early GM Gen V LTx\u003c\/li\u003e\n\u003cli\u003eHarness Application: LT\u003c\/li\u003e\n\u003cli\u003eHarness Type: Injector\u003c\/li\u003e\n\u003cli\u003eIdentifying Feature: 4-pin fuel pressure sensor\u003c\/li\u003e\n\u003cli\u003eSub Category: Wire, Cable and Related Components\u003c\/li\u003e\n\u003cli\u003eWarning: California Proposition 65\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-220\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eHow do I know if I need the early or late sub harness?\u003c\/h5\u003e\u003cp\u003eCheck the fuel pressure sensor on the back of the driver-side fuel rail: a 4-pin connector is early (558-220), a 3-pin connector is late (558-221).\u003c\/p\u003e\u003ch5\u003eWhat is this harness used for?\u003c\/h5\u003e\u003cp\u003eConnecting the GM Gen V GDI controller to the factory injectors on early LTx engines.\u003c\/p\u003e\u003ch5\u003eIs this harness legal for street use?\u003c\/h5\u003e\u003cp\u003eNo. It is legal for sale and use only on Racing Use Only vehicles — competition vehicles not registered or operated on the street.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How do I know if I need the early or late sub harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Check the fuel pressure sensor on the back of the driver-side fuel rail: a 4-pin connector is early (558-220), a 3-pin connector is late (558-221).\"}},{\"@type\":\"Question\",\"name\":\"What is this harness used for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Connecting the GM Gen V GDI controller to the factory injectors on early LTx engines.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness legal for street use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It is legal for sale and use only on Racing Use Only vehicles — competition vehicles not registered or operated on the street.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418643894320,"sku":"GVMR_558-220","price":158.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/5fa66e9712a36d5c1bff601764d58e90ec62ce14.png?v=1758389507"}],"url":"https:\/\/berryperformancesales.com\/collections\/fuel-injection-harness.oembed?page=3","provider":"Berry Performance Sales","version":"1.0","type":"link"}