Holley is quickly becoming The New Standard In EFI! Holley’s HP ECU is standard equipment on the 2013/2014 Chevrolet COPO Camaro and Holley’s EFI throttle body powers every NASCAR Sprint Cup Series™ team. Top racers are making the switch to Holley EFI every day. Racers like Tom Bailey who set three new records and took the overall event win on the 2013 Hot Rod Magazine Drag Week and John Scali who used it to win the 2013 JEGS All-Star race. But that’s not all. The world’s best hot rod builders and tuners are making the switch to Holley EFI. Builders like Dave Lane who used Holley EFI to power the 2013 Goodguys Hot Rod of the Year and tuners like Steve Morris who use it to build some of the baddest forced induction beasts on the planet. It’s the easiest, most refined, feature-rich system that money can buy. But, don’t take our word for it, see what the best are saying about Holley EFI!
Holley EFI
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HOLLEY EFI TERMINATOR X MAX – GEN IV 4.8/5.3/6.0 GM TRUCK ENGINES AND LS2/LS3 58x Crank – 4x Cam – EV1 Injectors – Drive-By-Wire Throttle Body Control – 3.5 in. Touchscreen Part # 550-933
Original price was: $2,033.00.$1,695.95Current price is: $1,695.95. -
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HOLLEY EFI TERMINATOR X MAX – GEN IV 4.8/5.3/6.0 GM TRUCK ENGINES AND LS2/LS3 58x Crank – 4x Cam – EV1 Injectors – Transmission Control – 3.5 in. Touchscreen Part # 550-920
Original price was: $2,033.00.$1,645.95Current price is: $1,645.95. -
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HOLLEY EFI TERMINATOR X MAX – GEN IV 4.8/5.3/6.0 GM TRUCK ENGINES AND LS2/LS3 58x Crank – 4x Cam – EV6 Injectors – Drive-By-Wire Throttle Body and Transmission Control – 3.5 in. Touchscreen Part # 550-928
Original price was: $2,287.00.$1,799.95Current price is: $1,799.95. -
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HOLLEY EFI TERMINATOR X MAX – GEN IV 4.8/5.3/6.0 GM TRUCK ENGINES AND LS2/LS3 58x Crank – 4x Cam – EV6 Injectors – Drive-By-Wire Throttle Body Control – 3.5 in. Touchscreen Part # 550-931
Original price was: $2,033.00.$1,645.95Current price is: $1,645.95. -
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HOLLEY EFI TERMINATOR X MAX – GEN IV 4.8/5.3/6.0 GM TRUCK ENGINES AND LS2/LS3 58x Crank – 4x Cam – EV6 Injectors – Transmission Control – 3.5 in. Touchscreen Part # 550-918
Original price was: $2,033.00.$1,645.95Current price is: $1,645.95. -
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HOLLEY EFI TERMINATOR X MAX – GEN IV 4.8/5.3/6.0 GM TRUCK ENGINES AND LS2/LS3 58x Crank – 4x Cam – EV6 Injectors – Transmission Control – USB/CAN Tuning Cable Part # 550-918T
Original price was: $1,969.00.$1,594.95Current price is: $1,594.95. -
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HOLLEY EFI TERMINATOR X MAX – LS1/LS6 24x Crank – 1x Cam – EV1 Injectors – Drive-By-Wire Throttle Body and Transmission Control – 3.5 in. Touchscreen Part # 550-926
Original price was: $2,287.00.$1,907.95Current price is: $1,907.95. -
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HOLLEY EFI TERMINATOR X MAX – LS1/LS6 24x Crank – 1x Cam – EV1 Injectors – Drive-By-Wire Throttle Body Control – 3.5 in. Touchscreen Part # 550-929
Original price was: $2,033.00.$1,695.95Current price is: $1,695.95. -
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HOLLEY EFI TERMINATOR X MAX – LS1/LS6 24x Crank – 1x Cam – EV1 Injectors – Transmission Control – 3.5 in. Touchscreen Part # 550-916
Original price was: $2,033.00.$1,645.95Current price is: $1,645.95. -
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HOLLEY EFI TERMINATOR X MAX – LS1/LS6 24x Crank – 1x Cam – EV1 Injectors – Transmission Control – USB/CAN Tuning Cable Part # 550-916T
Original price was: $1,969.00.$1,641.95Current price is: $1,641.95. -
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HOLLEY EFI TERMINATOR X MAX – LS1/LS6 24x Crank – 1x Cam – EV6 Injectors – Drive-By-Wire Throttle Body and Transmission Control – 3.5 in. Touchscreen Part # 550-934
Original price was: $2,287.00.$1,799.95Current price is: $1,799.95. -
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HOLLEY EFI TERMINATOR X MAX – LS1/LS6 24x Crank – 1x Cam – EV6 Injectors – Drive-By-Wire Throttle Body Control – 3.5 in. Touchscreen Part # 550-932
Original price was: $2,033.00.$1,695.95Current price is: $1,695.95. -
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HOLLEY EFI TERMINATOR X MAX – LS1/LS6 24x Crank – 1x Cam – EV6 Injectors – Transmission Control – 3.5 in. Touchscreen Part # 550-919
Original price was: $2,033.00.$1,645.95Current price is: $1,645.95. -
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Holley EFI Terminator X Universal MPFI Kit Part # 550-936
Original price was: $1,587.00.$1,284.95Current price is: $1,284.95. -
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HOLLEY EFI HOLLEY LCD TOUCH SCREEN Wide range of tuning and data-monitoring options in a compact 3.5″ LCD display Part # 553-108
Original price was: $416.95.$369.95Current price is: $369.95. -
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HOLLEY EFI HOLLEY SMART COIL REMOTE COIL RELOCATION BRACKETS for Holley Smart Coils, Remote Relocation System – Black Finish Part # 561-131
Original price was: $246.95.$218.95Current price is: $218.95. -
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Read moreHOLLEY EFI HOLLEY SMART COIL REMOTE COIL RELOCATION BRACKETS for Holley Smart Coils, Remote Relocation System – Natural Finish Part # 561-125
Original price was: $176.00.$157.95Current price is: $157.95. -
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HOLLEY EFI HOLLEY STANDALONE DIGITAL DASH KIT 7″ Digital Dash, Compact & Fully Customizable! Part # 553-109
Original price was: $1,627.95.$1,446.95Current price is: $1,446.95. -
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HOLLEY EFI HP EFI ECU & HARNESS KITS Complete 99-04 2 Valve Ford Modular Engine Plug and Play Kit – Jetronic “Bosch Style” injector harness – Bosch Wideband O2 Part # 550-616
Original price was: $3,374.95.$2,999.95Current price is: $2,999.95. -
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Read moreHOLLEY EFI HP EFI ECU & HARNESS KITS Complete 99-04 2 Valve Ford Modular Engine Plug and Play Kit – Jetronic “Bosch Style” injector harness – Includes NTK Oxygen Sensor Part # 550-616N
Original price was: $3,656.95.$3,249.95Current price is: $3,249.95. -
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HOLLEY EFI HP EFI ECU & HARNESS KITS Complete 99-04 4 Valve Ford Modular Engine Plug and Play Kit – Jetronic “Bosch Style” injector harness – Bosch Wideband O2 Part # 550-617
Original price was: $3,374.95.$2,999.95Current price is: $2,999.95. -
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Read moreHOLLEY EFI HP EFI ECU & HARNESS KITS Complete 99-04 4 Valve Ford Modular Engine Plug and Play Kit – Jetronic “Bosch Style” injector harness – Includes NTK Oxygen Sensor Part # 550-617N
Original price was: $3,656.95.$3,249.95Current price is: $3,249.95. -
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HOLLEY EFI HP EFI ECU & HARNESS KITS GM LS1/LS6 (24x crank sensor) with Jetronic/Minitimer (Bosch type) connectors on injector harness (fits Holley 522-xxx injectors), Includes Bosch Oxygen Sensor Part # 550-602
Original price was: $2,924.95.$2,599.95Current price is: $2,599.95. -
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HOLLEY EFI HP EFI ECU & HARNESS KITS GM LS1/LS6 (24x crank sensor) with Jetronic/Minitimer (Bosch type) connectors on injector harness (fits Holley 522-xxx injectors), Includes NTK Oxygen Sensor Part # 550-602N
Original price was: $3,206.95.$2,849.95Current price is: $2,849.95. -
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HOLLEY EFI HP EFI ECU & HARNESS KITS GM LS2/3/7 (58x crank sensor) with Jetronic/Minitimer (Bosch type) connectors on injector harness (fits Holley 522-xxx injectors), Includes Bosch Oxygen Sensor Part # 550-607
Original price was: $2,924.95.$2,599.95Current price is: $2,599.95. -
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HOLLEY EFI HP EFI ECU & HARNESS KITS GM LS2/3/7 (58x crank sensor) with Jetronic/Minitimer (Bosch type) connectors on injector harness (fits Holley 522-xxx injectors), Includes NTK Oxygen Sensor Part # 550-607N
Original price was: $3,206.95.$2,849.95Current price is: $2,849.95. -
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HOLLEY EFI HP EFI ECU & HARNESS KITS GM LS2/3/7 (58x crank sensor) with USCAR (EV6 Style) connectors on injector harness, Includes Bosch Oxygen Sensor Part # 550-603
Original price was: $2,924.95.$2,599.95Current price is: $2,599.95. -
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HOLLEY EFI HP EFI ECU & HARNESS KITS GM LS2/3/7 (58x crank sensor) with USCAR (EV6 Style) connectors on injector harness, Includes NTK Oxygen Sensor Part # 550-603N
Original price was: $3,206.95.$2,849.95Current price is: $2,849.95. -
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HOLLEY EFI HP EFI ECU & HARNESS KITS GM TPI and Holley Stealth Ram™, Includes Bosch Oxygen Sensor Part # 550-601
Original price was: $2,812.95.$2,499.95Current price is: $2,499.95. -
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HOLLEY EFI HP EFI ECU & HARNESS KITS GM TPI and Holley Stealth Ram™, Includes NTK Oxygen Sensor Part # 550-601N
Original price was: $3,093.95.$2,749.95Current price is: $2,749.95. -
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HOLLEY EFI HP EFI ECU & HARNESS KITS Universal FORD V8 Multi-Point Fuel Injection, Includes Bosch Oxygen Sensor, and Ford V8 Injector Harness. Part # 550-606
Original price was: $2,812.95.$2,499.95Current price is: $2,499.95. -
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HOLLEY EFI HP EFI ECU & HARNESS KITS Universal FORD V8 Multi-Point Fuel Injection, Includes NTK Oxygen Sensor, and Ford V8 Injector Harness. Part # 550-606N
Original price was: $3,093.95.$2,749.95Current price is: $2,749.95. -
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Read moreHOLLEY EFI HP EFI ECU & HARNESS KITS Universal V8 Multi-Point Fuel Injection, Includes Bosch Oxygen Sensor Part # 550-604
Original price was: $2,812.95.$2,499.95Current price is: $2,499.95. -
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HOLLEY EFI HP EFI ECU & HARNESS KITS Universal V8 Multi-Point Fuel Injection, Includes NTK Oxygen Sensor Part # 550-604N
Original price was: $3,093.95.$2,749.95Current price is: $2,749.95. -
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Read moreHOLLEY EFI HP EFI ECU & HARNESS KITS Unterminated Universal Harness, Includes Bosch Oxygen Sensor Part # 550-605
Original price was: $2,812.95.$2,499.95Current price is: $2,499.95. -
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HOLLEY EFI HP EFI ECU & HARNESS KITS Unterminated Universal Harness, Includes NTK Oxygen Sensor Part # 550-605N
Original price was: $3,093.95.$2,749.95Current price is: $2,749.95. -
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HOLLEY EFI HP EFI ECU HP EFI ECU, USB Cable, and Software Part # 554-113
Original price was: $1,958.95.$1,740.95Current price is: $1,740.95. -
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HOLLEY EFI HP SMART COIL IGNITION HARNESS For use with Holley® HP and Dominator ECUs and other EFI systems Part # 558-312
Original price was: $272.95.$241.95Current price is: $241.95. -
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HOLLEY EFI INJECTOR DRIVER HARNESS Part # 558-219
Original price was: $323.95.$287.95Current price is: $287.95. -
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HOLLEY EFI INJECTOR HARNESS – EARLY TRUCK LS MULTEC 2 INJECTOR HARNESS – EARLY TRUCK Part # 558-214
Original price was: $284.95.$252.95Current price is: $252.95. -
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HOLLEY EFI LS COIL EXTENSION HARNESSES Designed to extend your factory coil harness, allowing you to easily remote mount your LS ignition coils. Part # 558-326
Original price was: $131.95.$116.95Current price is: $116.95. -
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HOLLEY EFI LS COIL HARNESSES Factory replacement coil harness for stock LS coils, does not fit LS1 or LS6 Coils. Part # 558-321
Original price was: $202.95.$179.95Current price is: $179.95. -
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HOLLEY EFI LS1/6 (24X/1X) ENGINE MAIN HARNESS LS1/6 Main Harness for HP EFI & Dominator EFI Part # 558-102
Original price was: $653.95.$580.95Current price is: $580.95. -
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Read moreHOLLEY EFI LS1/6 (24X/1X) ENGINE MAIN HARNESS, EXTENDED LENGTH LS1/6 Main Harness for HP EFI & Dominator EFI Part # 558-133
Original price was: $695.95.$617.95Current price is: $617.95. -
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HOLLEY EFI LS2/3/7+ (58X/4X) ENGINE MAIN HARNESS EXTENDED LENGTH LS2/3/7+ (58x/4x) Engine Main Harness for HP EFI & Dominator EFI Part # 558-134
Original price was: $695.95.$617.95Current price is: $617.95. -
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HOLLEY EFI LS2/3/7+ (58X/4X) ENGINE MAIN HARNESS LS2/3/7+ (58x/4x) Engine Main Harness for HP EFI & Dominator EFI Part # 558-103
Original price was: $653.95.$580.95Current price is: $580.95. -
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HOLLEY EFI LSX INJECTOR HARNESS – FOR EV6 STYLE INJECTORS LSx Injector Harness for HP EFI, Dominator EFI and Terminator X. Part # 558-201
Original price was: $178.95.$158.95Current price is: $158.95. -
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HOLLEY EFI MAIN ENGINE HARNESS FOR 24X LS W/TBI Main Harness for us with 24x/1x Gen 3 LS with Terminator Throttle Body Fuel Injection Part # 558-111
Original price was: $722.95.$641.95Current price is: $641.95. -
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HOLLEY EFI MAIN ENGINE HARNESS FOR 58X LS W/TBI Main Harness for us with 58x/4x Gen 4 LS with Terminator Throttle Body Fuel Injection Part # 558-112
Original price was: $735.95.$653.95Current price is: $653.95. -
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HOLLEY EFI MAIN POWER HARNESS Main Power Harness for Avenger EFI, HP EFI, & Dominator EFI Part # 558-308
Original price was: $102.95.$90.75Current price is: $90.75.































