Performance EFI System Wiring Harnesses
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Holley®EFI Harness Kit (558-505)EFI Harness Kit (558-505) by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more....Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$1,149.95 - Holley®EFI Harness Kit (558-500)EFI Harness Kit by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more. From start to...Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$749.95
- Holley®EFI Harness Kit (558-501)EFI Harness Kit (558-501) by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more....Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$715.95
- Holley®EFI Injector Harness Kit (558-508)EFI Injector Harness Kit (558-508) by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much...Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$649.95
- Holley®EFI LS Main Harness MAP Sensor Adapter (558-416)EFI LS Main Harness MAP Sensor Adapter by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and...Made with precision and quality in mindBuilt to last$34.95
- Holley®EFI LS1 Main Harness (558-102)EFI LS1 Main Harness by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more. From...Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$549.95
- Holley®EFI LS2 Main Harness (558-103)EFI LS2 Main Harness by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more. From...Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$549.95
- Holley®EFI Main Harness Kit (558-110)EFI Main Harness Kit (558-110) by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much...Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$649.95
- Holley®EFI Main Harness Kit (558-108)EFI Main Harness Kit (558-108) by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much...Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$619.95
- Holley®EFI Main Harness Kit for Smart Coils (558-113)EFI Main Harness Kit for Smart Coils (558-113) by Holley®. With Smart Coils. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel...Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$679.95
- Holley®EFI Sub Harness Kit (558-125)EFI Sub Harness Kit (558-125) by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more....Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$299.95
- Holley®EFI Sub Harness Kit (558-124)EFI Sub Harness Kit (558-124) by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more....Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$299.95
- Holley®EFI System Wiring Harness (558-510)EFI System Wiring Harness by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more....Plug and Play with Dominator or HP ECU and Coyote Ti-VCT ControllerConnectors are labeled for easy identification$1,395.95
- Holley®GM LS1 ECU and Harness Kit (550-602N)GM LS1 ECU and Harness Kit by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more....Simple Installation - Plug and Play control of GM LS1/LS6 engines. Just plug the harness into your factory sensors, wire the power and grounds and you are ready to take complete control of your LS engineMore Functionality - Provides significantly more functionality than OEM or other competitive ECUs (boost control, nitrous control, water/meth injection, plus a host of additional inputs and outputs to control fans, pumps, relays etc.)$2,761.95
- Holley®GM LS2 ECU and Harness Kit (550-607)GM LS2 ECU and Harness Kit by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more....Simple Installation - Plug and Play control of GM LS2/LS3/LS7 engines. Just plug the harness into your factory sensors, wire the power and grounds and you are ready to take complete control of your LS engineMore Functionality - Provides significantly more functionality than OEM or other competitive ECUs (boost control, nitrous control, water/meth injection, plus a host of additional inputs and outputs to control fans, pumps, relays etc.)$2,544.95
- Holley®GM LS2 ECU and Harness Kit (550-607N)GM LS2 ECU and Harness Kit by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more....Simple Installation - Plug and Play control of GM LS2/LS3/LS7 engines. Just plug the harness into your factory sensors, wire the power and grounds and you are ready to take complete control of your LS engineMore Functionality - Provides significantly more functionality than OEM or other competitive ECUs (boost control, nitrous control, water/meth injection, plus a host of additional inputs and outputs to control fans, pumps, relays etc.)$2,761.95
- Holley®GM LS2 ECU and Harness Kit (550-603N)GM LS2 ECU and Harness Kit by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more....Simple Installation - Plug and Play control of GM LS2/LS3/LS7 engines. Just plug the harness into your factory sensors, wire the power and grounds and you are ready to take complete control of your LS engineMore Functionality - Provides significantly more functionality than OEM or other competitive ECUs (boost control, nitrous control, water/meth injection, plus a host of additional inputs and outputs to control fans, pumps, relays etc.)$2,761.95
- Holley®GM TPI and Holley Stealth Ram Harness Kit (550-601N)GM TPI and Holley Stealth Ram Harness Kit by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds,...“Quick Start” ignition and fueling strategy for LS x EngineData Logger. Scalable axes, Smoothing, Multiple graph view ability, Pre-defined notes fields and many more$2,669.95
- Holley®Gauge Power Harness (553-140)Gauge Power Harness by Holley®. 8 Connection. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much...Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$9.70
- Holley®HP EFI ECU and Harness Kit (550-606)HP EFI ECU and Harness Kit (550-606) by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and...Made with precision and quality in mindBuilt to last$2,400.95
- Holley®HP EFI ECU and Harness Kit (550-606N)HP EFI ECU and Harness Kit (550-606N) by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and...Made with precision and quality in mindBuilt to last$2,619.95
- Holley®Harness Kit (558-506)Harness Kit by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more. From start to...Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$1,149.95
- Holley®Hemi Main Harness (558-115)Hemi Main Harness by Holley®. Early, with Tps & Iac. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and...Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$639.95
- Holley®Hemi Main Harness (558-116)Hemi Main Harness by Holley®. Late, with Tps & Iac. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and...Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$639.95
- Holley®MPFI Harness Unerminated at injector connectors (Bosch style) (558-207)MPFI Harness Unerminated at injector connectors (Bosch style) by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection,...Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$249.95
- Holley®MPFI Harness Unerminated at injector connectors (Bosch style) (558-208)MPFI Harness Unerminated at injector connectors (Bosch style) by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection,...Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$339.95
- Holley®MPFI Main Harness (558-104)MPFI Main Harness by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more. From start...Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$459.95
- Holley®TPI/Stealth Ram Main Harness (558-101)TPI/Stealth Ram Main Harness by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more....Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$479.95
- Holley®Ti-VCT EFI Main Harness Kit for Smart Coils (558-122)Ti-VCT EFI Main Harness Kit for Smart Coils (558-122) by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake...Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$709.95
- Holley®Transmission Control Harness (558-455)Transmission Control Harness by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more....Top-grade fuel system upgrade that will take your driving to the next levelDesigned to help you maximize your vehicle’s fuel system efficiency$229.95
