Multi-Port EFI Kits

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 Terminator X GM LS Standalone ECU & Wire Harness 550-910T - 58x/EV1 Without 3.5" Handheld 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...

Holley Terminator X GM LS Standalone ECU & Wire Harness 550-905 - 58x/EV6 (Without Hand-Held) 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...

Holley Terminator X Max GM LS Standalone ECU & Wire Harness 550-935 - 58x/EV1/Trans Control/DBW 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 Max GM LS Standalone ECU & Wire Harness 550-934 - 24x/EV6/Trans Control/DBW 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...

Holley Terminator X Max Gen IV GM LS Standalone ECU & Wire Harness 550-933 - 58x/Bosch EV1/DBW 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 Max GM LS Standalone ECU & Wire Harness 550-932 - 24x/EV6/DBW 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 control of your...

Holley Terminator X Max GM LS Standalone ECU & Wire Harness 550-920 - 58x/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 control...

Holley Terminator X Max GM LS Standalone ECU & Wire Harness 550-919 - 24x/EV6/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 control...

Holley Terminator X GM LS Standalone ECU & Wire Harness 550-910 - 58x/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 Terminator X GM LS Standalone ECU & Wire Harness 550-909 - 24x/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 Max GM LS Standalone ECU & Wire Harness 550-929 - 24x/EV1/DBW 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 control of your...