Multi-Port EFI Kits

Holley Terminator X Max GM LS Standalone ECU & Wire Harness 550-916 - 24x/EV1/Trans Control Take control of your LS engine with Terminator X Max! Don't settle for a junkyard ECU with a cumbersome tuning interface when you can have complete...

Holley Terminator X GM LS Standalone ECU & Wire Harness 550-905 - 58x/EV6 Take control of your LS engine with Terminator X! Don't settle for a junkyard ECU with a cumbersome tuning interface when you can have complete control of your engine,...

Holley Terminator X GM LS Standalone ECU & Wire Harness 550-904 - 24x/Multec 2 Take control of your LS engine with Terminator X! Don't settle for a junkyard ECU with a cumbersome tuning interface when you can have complete control of your engine,...

Holley Terminator X GM LS Standalone ECU & Wire Harness 550-903 - 24x/EV1 Take control of your LS engine with Terminator X! Don't settle for a junkyard ECU with a cumbersome tuning interface when you can have complete control of your engine,...

Holley EFI LS Main Harness to LS3 Style Map Sensor Adapter 558-416 Holley EFI LS main harnesses have a MAP sensor connecter designed for use with an LS1/2 style MAP sensor. The 558-416 is an adapter harness that can be used to adapt any LS harness that...

Holley Terminator GM LS 4.8,5.3,6.0L 24x MPFI Kit 550-614 Features: For 1997 to 2007 4.8/5.3/6.0 truck engines with 24x crank reluctor/span> Kit includes everything you need to control your stock or mild LS Bosch wideband oxygen sensor included...

Holley Terminator GM LS 58x MPFI Kit w/ DBW & Trans Control 550-613 Features: For GM LS2/3 engines and 2007 to current 4.8/5.3/6.0 truck engines with 58x crank reluctor, drive-by-wire, and 4L60/4L80E transmissions Kit includes everything you...

Holley HP EFI GM LS 58x ECU & Harness Kit w/ NTK O2 550-607N Features & Benifits: Intuitive software and features designed for novice and veteran tuners  Fuel and Ignition Control for 4, 6, 8, 10 cylinder even fire engines  Capable of...

Holley HP EFI GM LS 58x ECU & Harness Kit w/ Bosch O2 550-607 Features & Benifits: Intuitive software and features designed for novice and veteran tuners  Fuel and Ignition Control for 4, 6, 8, 10 cylinder even fire...

Holley HP EFI GM LS 58x ECU & Harness Kit w/ NTK O2 550-603N Features & Benifits: Intuitive software and features designed for novice and veteran tuners  Fuel and Ignition Control for 4, 6, 8, 10 cylinder even fire engines  Capable of...

Holley HP EFI GM LS 58x ECU & Harness Kit w/ Bosch O2 550-603 550-602 Features & Benifits: Intuitive software and features designed for novice and veteran tuners  Fuel and Ignition Control for 4, 6, 8, 10 cylinder even fire engines ...

Holley HP EFI GM LS 24x ECU & Harness Kit w/ NTK O2 550-602N Features & Benifits: Intuitive software and features designed for novice and veteran tuners  Fuel and Ignition Control for 4, 6, 8, 10 cylinder even fire engines  Capable of...