Fuel Injection System Wiring Harnesses - No Stock EFI System - In Stock Filter Options - Vendor In Stock Filter Options - Free Shipping on Orders Over $109 at Summit Racing

Holley EFI Systems Wiring Harnesses 558-112

Wiring Harnesses, Holley EFI, Main Harness, 58X LS TBI, for Terminator, Terminator Stealth, Throttle Body Systems, Chevy, Each

Part Number: HLY-558-112

Not Yet Reviewed

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Holley EFI CAN Adapter Harnesses 558-451

Fuel Injection System Wiring Harnesses, Holley EFI, CAN Adapter Harness, Male to Female Adapter, 12 in. Long, for Racepak or CAN Device, Each

Part Number: HLY-558-451

Not Yet Reviewed

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Holley EFI Terminator Stealth Main Wiring Harnesses 558-121

Fuel Injection System Wiring Harnesses, Holley EFI, Terminator Stealth 2x4, Upgrade Main Harness, Plug-and-Play, Universal, Kit

Part Number: HLY-558-121

Not Yet Reviewed

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Holley EFI Systems Wiring Harnesses 558-113

Wiring Harnesses, Holley EFI, Ford 2V/4V Modular, Main Harness, Multi-Port Fuel Injection, for Holley Smart Coils, HP EFI System, Ford, 4.6-5.4L, Each

Part Number: HLY-558-113

Not Yet Reviewed

Estimated Ship Date: Mar 9, 2026 if ordered today

...Loading

Estimated Ship Date: Mar 9, 2026 if ordered today

Holley EFI Systems Main Wiring Harnesses 558-141

Wiring Harnesses, Holley EFI, Main Harness with Smart Coils, 7.3L Godzilla, Ford Each

Part Number: HLY-558-141

Not Yet Reviewed

Estimated Ship Date: Mar 9, 2026 if ordered today

...Loading

Estimated Ship Date: Mar 9, 2026 if ordered today

Holley EFI Terminator X Drive-By-Wire Throttle Body Wiring Harnesses 558-469

Fuel Injection System Wiring Harnesses, Holley EFI, 7.3 L Godzilla, Drive-by-Wire, Throttle Body Harness, for Terminator X, Ford, Each

Part Number: HLY-558-469

Not Yet Reviewed

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Holley EFI Systems Wiring Harnesses 558-439

Fuel Injection System Wiring Harnesses, Holley EFI, Terminator, Throttle Body Systems, Plug-and-Play, Upgrade Harness, for 205 lb./hr. Injectors, Each

Part Number: HLY-558-439

Not Yet Reviewed

Estimated Ship Date: Mar 9, 2026 if ordered today

...Loading

Estimated Ship Date: Mar 9, 2026 if ordered today

Holley EFI Systems Wiring Harnesses 558-502

Fuel Injection System Wiring Harnesses, Holley EFI, GM LS 58X Crank Sensor, Power, Bosch Injector, Main Harnesses, for HP, Dominator ECUs, Kit

Part Number: HLY-558-502

Not Yet Reviewed

Estimated Ship Date: Mar 9, 2026 if ordered today

...Loading

Estimated Ship Date: Mar 9, 2026 if ordered today

Holley EFI Systems Wiring Harnesses 558-504

Fuel Injection System Wiring Harnesses, Holley EFI, Universal, V8 MPFI Harness, with Main, Power, Bosch Injector Harnesses, for HP, Dominator ECU, Kit

Part Number: HLY-558-504

Not Yet Reviewed

Estimated Ship Date: Mar 9, 2026 if ordered today

...Loading

Estimated Ship Date: Mar 9, 2026 if ordered today

Holley EFI Systems Wiring Harnesses 558-306

Fuel Injection System Wiring Harnesses, Holley EFI, Unterminated, Ignition Harness, with Pins, Seals, Connector, for HP, Dominator EFI Systems, Kit

Part Number: HLY-558-306

Not Yet Reviewed

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Holley Replacement Fuel Injector Wiring Harnesses 558-219

Fuel Injection System Wiring Harnesses, Holley EFI, Replacement, Injector Driver harness, Plug-and-Play, MPFI, JB2 Connector, for Dominator ECU, Each

Part Number: HLY-558-219

Not Yet Reviewed

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Holley Replacement Fuel Injector Wiring Harnesses 558-207

Fuel Injection System Wiring Harnesses, Holley EFI, Replacement, Injector Harness, Unterminated Base, Bosch EV1 Style, with Connector, 16-piece, Set

Part Number: HLY-558-207

Not Yet Reviewed

Estimated Ship Date: Mar 6, 2026 if ordered today

...Loading

Estimated Ship Date: Mar 6, 2026 if ordered today

Holley EFI Systems Wiring Harnesses 558-108

Wiring Harnesses, Holley EFI, Ford 2V/4V Modular, Main Harness, Multi-port Fuel Injection, for HP, Dominator, EFI Systems, Ford, 4.6-5.4L, Each

Part Number: HLY-558-108

Not Yet Reviewed

Estimated Ship Date: Mar 9, 2026 if ordered today

...Loading

Estimated Ship Date: Mar 9, 2026 if ordered today

Holley Drive-By-Wire Throttle Body Wiring Harnesses 558-437

Fuel Injection System Wiring Harnesses, Holley EFI, Hemi Drive-By-Wire, Throttle Body Harness, for Holley Dominator EFI Only, Dodge, 5.7-6.4L, Each

Part Number: HLY-558-437

Not Yet Reviewed

Estimated Ship Date: Mar 9, 2026 if ordered today

...Loading

Estimated Ship Date: Mar 9, 2026 if ordered today

FAST XFI Fuel Injector Harnesses 301203

Wiring Harness, Fuel Injector, FAST XFI, Ford, Each

Part Number: FST-301203

Not Yet Reviewed

Estimated Ship Date: Apr 22, 2026 if ordered today

...Loading

Estimated Ship Date: Apr 22, 2026 if ordered today

Holley EFI Systems Wiring Harnesses 558-101

Wiring Harnesses, Holley EFI, Replacement Harness, Multi-Port, Speed Density Metered, for Avenger, HP, Dominator, EFI Systems, with Stealth Ram, Each

Part Number: HLY-558-101

Not Yet Reviewed

Estimated Ship Date: Mar 9, 2026 if ordered today

...Loading

Estimated Ship Date: Mar 9, 2026 if ordered today

FAST XFI Fuel Injector Harnesses 301200

Wiring Harness, Fuel Injector, FAST XFI, Chevy, 18436572 Firing Order, Each

Part Number: FST-301200

Not Yet Reviewed

Estimated Ship Date: Apr 20, 2026 if ordered today

...Loading

Estimated Ship Date: Apr 20, 2026 if ordered today

FAST EZ-EFI 2.0 Replacement Main Wiring Harnesses 30308

Main Wiring Harness, EZ-EFI 2.0 Replacement, Throttle Body Injection Style, Universal, FAST, Each

Part Number: FST-30308

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Apr 22, 2026 if ordered today

...Loading

Estimated Ship Date: Apr 22, 2026 if ordered today

Holley EFI Systems Wiring Harnesses 558-510

Fuel Injection System Wiring Harnesses, Holley EFI, Coyote Ti-VCT, with Main, Power, Injector, Coil Harnesses, for HP, Dominator ECU, Ford, 5.0L, Kit

Part Number: HLY-558-510

Not Yet Reviewed

Estimated Ship Date: Mar 6, 2026 if ordered today

...Loading

Estimated Ship Date: Mar 6, 2026 if ordered today

FAST Idle Air Control Harness Adapters 308023

Harness Adapter, IAC to FAST EFI, Chevy, Pontiac, Each

Part Number: FST-308023

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Holley Replacement Fuel Injector Wiring Harnesses 558-500

Fuel Injection System Wiring Harnesses, Holley EFI, GM LS 24X Crank Sensor, Includes Power, LS1 Injector, Main Harnesses, for HP, Dominator ECUs, Kit

Part Number: HLY-558-500

Not Yet Reviewed

Estimated Ship Date: Mar 9, 2026 if ordered today

...Loading

Estimated Ship Date: Mar 9, 2026 if ordered today

Holley Drive-By-Wire Throttle Body Wiring Harnesses 558-418

Fuel Injections System Wiring Harnesses, Gen III Hemi, Drive-By-Wire Harness, Late Pedal, OE Connectors, Plug-and-Play, Chrysler, Dodge, Jeep, Kit

Part Number: HLY-558-418

Not Yet Reviewed

Estimated Ship Date: Mar 9, 2026 if ordered today

...Loading

Estimated Ship Date: Mar 9, 2026 if ordered today

Holley EFI Systems Main Wiring Harnesses for 2011-2017 F-150, MUSTANG - 558-122

Fuel Injection System Wiring Harnesses, Holley EFI, Coyote Ti-VCT, Main Harness, Plug-and-Play, Drive-by-Wire, with Holley Smart Coils, Ford, 5.0L Kit

Part Number: HLY-558-122

Not Yet Reviewed

Estimated Ship Date: Mar 6, 2026 if ordered today