Fuel Injection System Wiring Harnesses - No Stock EFI System

Holley EFI Systems Wiring Harnesses 558-115

Wiring Harnesses, Holley EFI, Gen III Hemi, Throttle Position, Idle Air Controls, Factory Connectors, Chrysler, Dodge, Jeep, Hemi, Early Model, Each

Part Number: HLY-558-115

Not Yet Reviewed

Estimated Ship Date: Nov 11, 2026 if ordered today

...Loading

Estimated Ship Date: Nov 11, 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: Nov 11, 2026 if ordered today

...Loading

Estimated Ship Date: Nov 11, 2026 if ordered today

Holley EFI Systems Wiring Harnesses 558-440

Fuel Injection Systems Wiring Harnesses, Holley EFI, Universal Harness, Four Cylinder, EV14 Injectors, 205 lbs.-hr. with HP/Dominator EFI, Each

Part Number: HLY-558-440

Not Yet Reviewed

Estimated Ship Date: Nov 11, 2026 if ordered today

...Loading

Estimated Ship Date: Nov 11, 2026 if ordered today

Holley EFI Systems Wiring Harnesses 558-203

Fuel Injection System Wiring Harnesses, Holley EFI, 6 Cylinder, MPFI, SFI, TBI, Injector Harness, for HP, Dominator EFI Systems, Universal, Each

Part Number: HLY-558-203

Not Yet Reviewed

Estimated Ship Date: Nov 11, 2026 if ordered today

...Loading

Estimated Ship Date: Nov 11, 2026 if ordered today

FAST EZ-EFI 2.0 Replacement Main Wiring Harnesses 30314

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

Part Number: FST-30314

Not Yet Reviewed

Estimated Ship Date: Dec 28, 2026 if ordered today

...Loading

Estimated Ship Date: Dec 28, 2026 if ordered today

Holley EFI Systems Main Wiring Harnesses 558-140

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

Part Number: HLY-558-140

Not Yet Reviewed

Estimated Ship Date: Monday 10/26/2026 if shipped by air

...Loading

Estimated Ship Date: Monday 10/26/2026 if shipped by air

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: Nov 11, 2026 if ordered today

...Loading

Estimated Ship Date: Nov 11, 2026 if ordered today

FAST Analog Input Kits 301402

HARNESS, FAST ANALOG INPUT KIT

Part Number: FST-301402

Not Yet Reviewed

Estimated Ship Date: Dec 28, 2026 if ordered today

...Loading

Estimated Ship Date: Dec 28, 2026 if ordered today

Haltech Nexus Universal V8 Injector Breakout Harnesses HT-186003

Fuel Injection System Wiring Harness, Nexus Universal V8 Injector Breakout Harness, Multi-port Fuel Injection Style, Each

Part Number: HTH-HT-186003

Not Yet Reviewed

Estimated Ship Date: Monday 10/26/2026 if shipped by air

...Loading

Estimated Ship Date: Monday 10/26/2026 if shipped by air

FAST XFI Fuel Injector Harnesses 301209

INJECTOR HARNESS, LS2-18726543 FIRE

Part Number: FST-301209

Not Yet Reviewed

Estimated Ship Date: Dec 28, 2026 if ordered today

...Loading

Estimated Ship Date: Dec 28, 2026 if ordered today

FAST XFI Fuel Injector Harnesses 301208

Wiring Harness, Fuel Injector, FAST XFI, Chrysler, Dodge, Ram, Each

Part Number: FST-301208

Not Yet Reviewed

Estimated Ship Date: Dec 28, 2026 if ordered today

...Loading

Estimated Ship Date: Dec 28, 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: Monday 10/26/2026 if shipped by air

...Loading

Estimated Ship Date: Monday 10/26/2026 if shipped by air

FiTech Fuel Injector Sub-Harnesses 70050-24

Fuel Injection System Wiring Harnesses, FiTech, EFI, Injector Sub Harness, Delphi Multec 2, Each

Part Number: FIF-70050-24

Not Yet Reviewed

Estimated Ship Date: Feb 1, 2027 if ordered today

...Loading

Estimated Ship Date: Feb 1, 2027 if ordered today

FuelTech FT550 6-Cylinder Universal Expansion B Harnesses 2002008377

FT550 6 CYLINDER UNIVERSAL B EXPANSION HARNESS

Part Number: FCH-2002008377

Not Yet Reviewed

Estimated Ship Date: Monday 10/26/2026 if shipped by air

...Loading

Estimated Ship Date: Monday 10/26/2026 if shipped by air

Haltech Nexus Rebel LS Terminated Harnesses HT-186500

Wiring Harness, Nexus Rebel, ECU, Plug-and-Play, Standard Length, Chevy, LS, Each

Part Number: HTH-HT-186500

Not Yet Reviewed

Estimated Ship Date: Monday 10/26/2026 if shipped by air

...Loading

Estimated Ship Date: Monday 10/26/2026 if shipped by air

Painless Performance Emission Device Control Harnesses 60320

Painless Performance Emission Device Control Harnesses 60320

Emission Wiring Harness, Rear Oxygen Sensor and Fuel Tank Pressure Sensor, Each

Part Number: PRF-60320

Not Yet Reviewed

Estimated Ship Date: Monday 10/26/2026 if shipped by air

...Loading

Estimated Ship Date: Monday 10/26/2026 if shipped by air

AEM Electronics 10 Channel Peak & Hold Injector Driver Wiring Harnesses 35-3900

Fuel Injection Wiring Harness, 10 Channel Peak and Hold Injector Driver Harness, Each

Part Number: AVM-35-3900

Not Yet Reviewed

Estimated Ship Date: Monday 10/26/2026 if shipped by air

...Loading

Estimated Ship Date: Monday 10/26/2026 if shipped by air

Holley Drive-By-Wire Throttle Body Wiring Harnesses 558-417

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

Part Number: HLY-558-417

Not Yet Reviewed

Estimated Ship Date: Nov 11, 2026 if ordered today

...Loading

Estimated Ship Date: Nov 11, 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: Nov 11, 2026 if ordered today

...Loading

Estimated Ship Date: Nov 11, 2026 if ordered 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: Nov 11, 2026 if ordered today

...Loading

Estimated Ship Date: Nov 11, 2026 if ordered today

Holley EFI Systems Wiring Harnesses 558-505

Fuel Injection System Wiring Harnesses, Holley EFI, 2V Modular EFI, with Main, Power, Injector Harnesses, for HP, Dominator ECU, Ford, 4.6-5.4L, Kit

Part Number: HLY-558-505

Not Yet Reviewed

Estimated Ship Date: Nov 11, 2026 if ordered today

...Loading

Estimated Ship Date: Nov 11, 2026 if ordered today

FiTech LS Coil Extension Harnesses 70050-26

Fuel Injection System Wiring Harnesses, FiTech, EFI, LS Coil Extension Harness, 36 in. Long, Each

Part Number: FIF-70050-26

Not Yet Reviewed

Estimated Ship Date: Feb 1, 2027 if ordered today

...Loading

Estimated Ship Date: Feb 1, 2027 if ordered today

FAST XFI Fuel Injector Harnesses 301210

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

Part Number: FST-301210

Not Yet Reviewed

Estimated Ship Date: Dec 28, 2026 if ordered today

...Loading

Estimated Ship Date: Dec 28, 2026 if ordered today

FAST XFI 2.0/XIM Super Cobra Jet Engine Harnesses 301150

Fuel injection wiring harness WIRING HARNESS, FAST XFI MAIN,FORD SCJ MODULAR

Part Number: FST-301150

Not Yet Reviewed

Estimated Ship Date: Dec 28, 2026 if ordered today

...Loading

Estimated Ship Date: Dec 28, 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: Dec 28, 2026 if ordered today

...Loading

Estimated Ship Date: Dec 28, 2026 if ordered today