Mercury Marquis Engine Control Modules

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$132 Off

Holley |

#425550918T

Holley 550-918T Terminator X Max LS2/LS3 MPFI Kit

Ignition Type:

Factory GM

Injector Connector:

USCAR (EV6)

Tuner Style:

USB/CAN Tuning Cable

$1,949.95

/each

$2,081.95

$157 Off

Holley |

#425550926T

Holley 550-926T Terminator X Max LS1 MPFI Kit

Ignition Type:

Factory GM

Injector Connector:

Jetronic / Minitimer (EV1)

Tuner Style:

USB/CAN Tuning Cable

$2,149.95

/each

$2,306.95

$229 Off

Holley |

#425550601N

Holley EFI 550-601N HP EFI ECU And Harness Kits

Ignition Type:

Universal

Injector Connector:

GM TPI

Sold in Quantity:

Kit

$2,999.95

/each

$3,228.95

$242 Off

Holley |

#425550602N

Holley 550-602N HP EFI ECU & Harness Kit, LS1/LS6, NTK O2

Ignition Type:

Factory GM

Injector Connector:

Jetronic / Minitimer (EV1)

Tuner Style:

USB/CAN Tuning Cable

$3,099.95

/each

$3,341.95

$294 Off

Holley |

#425550625N

Holley 550-625N 2013-2017 Ford Coyote Ti-VCT HP EFI Kit, NTK O2

Ignition Type:

Ford Coyote

Injector Connector:

USCAR (EV6)

Throttle Style:

Cable Driven

$4,149.95

/kit

$4,443.95

Replacing Sway Bars in a Mercury Comet

How to replace sway bars in a Mercury Comet and the advantages that come with it.

Gen III/IV LS Engine ID Guide

Looking to swap the venerable LS engine into your hot rod, muscle car, or classic truck? Take a look at our detailed identification guide for Gen III/IV LS engines before you hit the salvage yard or swap meet!

Tubular Control Arms on an S-10

In this Tech Tip, John responds to a customer question about tubular control arms.

How to Paint Engine Blocks- Complete Guide

Make Your Engine Stand Out with These Engine Block Painting Tips

Lower Control Arm Upgrade

Have a 1970-1994 GM A- or X-body in need of some new lower control arms? Take a look at what Speedway Motors' employee Steve L. has to say about our lower control arms!

Control Arm Upgrade

Save some weight by swapping in some upgraded control arms! Employee Steve L. reviews the 1970-81 Camaro Upper Control Arm.

Car Cooling System Components

How does a cooling system work? Why is your engine overheating? What parts should you be giving your attention to? This guide answers all your questions.

Engine Building Tool Guide

Professional insight on some useful crate engine tools that will improve your engine building experience.

Engine Cylinder Numbers

Historic Indy Engines

To celebrate the upcoming 106th running of the Indianaplis 500, here's a look back at a few of the engines that have competed at the Brickyard over the years.

$125 Off

Holley |

#425550909T

Holley 550-909T Terminator X 24X/1X EV1 LS MPFI Kit

Ignition Type:

Factory GM

Injector Connector:

Jetronic / Minitimer (EV1)

Tuner Style:

USB/CAN Tuning Cable

$1,449.95

/kit

$1,574.95

$132 Off

Holley |

#425550916T

Holley 550-916T Terminator X Max LS1 MPFI Kit

Ignition Type:

Factory GM

Injector Connector:

Jetronic / Minitimer (EV1)

Tuner Style:

USB/CAN Tuning Cable

$1,949.95

/each

$2,081.95

$125 Off

Holley |

#425550903T

Holley 550-903T Terminator X LS1 MPFI Kit

Ignition Type:

Factory GM

Injector Connector:

Jetronic / Minitimer (EV1)

Tuner Style:

USB/CAN Tuning Cable

$1,449.95

/each

$1,574.95

$125 Off

Holley |

#425550905T

Holley 550-905T Terminator X 58X/4X EV6 LS MPFI Kit

Ignition Type:

Factory GM

Injector Connector:

USCAR (EV6)

Tuner Style:

USB/CAN Tuning Cable

$1,449.95

/kit

$1,574.95

Edelbrock |

#32535712

Edelbrock 35712 Pro-Flo 4 ECU/Harness For Gen IV 58X LS Engines

GTIN Code:

00085347357123

Sold in Quantity:

Each

$1,210.95

/each

-6%

Holley |

#4255581270

Holley 558-127 EFI Benchtop Harness, Firmware, Dash, ECU Testing

GTIN Code:

090127136768

Sold in Quantity:

Each

$249.95

/kit

$266.95

$144 Off

Holley |

#4255501218

Holley 550-1218 Terminator X, Ford Modular 4V, EV1 Injectors

Ignition Type:

Ford 4V Mod Stock Coils

Injector Connector:

Jetronic / Minitimer (EV1)

Tuner Style:

Touchscreen Handheld

$2,049.95

/kit

$2,193.95

$144 Off

Holley |

#4255501219

Holley 550-1219 Terminator X, Ford Modular 4V, EV6 Injectors

Ignition Type:

Ford 4V Mod Stock Coils

Injector Connector:

USCAR (EV6)

Tuner Style:

Touchscreen Handheld

$2,049.95

/kit

$2,193.95

$144 Off

Holley |

#4255501220

Holley 550-1220 Terminator X, Ford Mod 2V or 4V, Smart Coils, EV1

Ignition Type:

Holley Smart Coils

Injector Connector:

Jetronic / Minitimer (EV1)

Tuner Style:

Touchscreen Handheld

$2,049.95

/kit

$2,193.95

$144 Off

Holley |

#4255501221

Holley 550-1221 Terminator X, Ford Mod 2V or 4V, Smart Coils, EV6

Ignition Type:

Holley Smart Coils

Injector Connector:

USCAR (EV6)

Tuner Style:

Touchscreen Handheld

$2,049.95

/kit

$2,193.95

$144 Off

Holley |

#4255501225

Holley 550-1225 Terminator X, 2007-13 Gen III Hemi, EV6 Injectors

Ignition Type:

Gen III Hemi Coil-on-Plug

Injector Connector:

USCAR (EV6)

Tuner Style:

Touchscreen Handheld

$2,049.95

/kit

$2,193.95

$269 Off

Holley |

#4255501312

Holley 550-1312 Terminator X Max, 13-15 Coyote Ti-VCT, EV1, 4R70W

Ignition Type:

Ford Coyote

Injector Connector:

Jetronic / Minitimer (EV1)

Tuner Style:

Touchscreen Handheld

$3,499.95

/kit

$3,768.95

$269 Off

Holley |

#4255501315

Holley 550-1315 Terminator X Max, 15.5-17 Coyote Ti-VCT EV6 4R70W

Ignition Type:

Ford Coyote

Injector Connector:

USCAR (EV6)

Tuner Style:

Touchscreen Handheld

$3,499.95

/kit

$3,768.95

$188 Off

Holley |

#4255501316

Holley 550-1316 Terminator X Max, Ford Modular 2V, EV1 Injectors

Ignition Type:

Ford 2V Mod Stock Coils

Injector Connector:

Jetronic / Minitimer (EV1)

Tuner Style:

Touchscreen Handheld

$2,399.95

/kit

$2,587.95

$188 Off

Holley |

#4255501319

Holley 550-1319 Terminator X Max, Ford Modular 4V, EV6 Injectors

Ignition Type:

Ford 4V Mod Stock Coils

Injector Connector:

USCAR (EV6)

Tuner Style:

Touchscreen Handheld

$2,399.95

/kit

$2,587.95

$188 Off

Holley |

#4255501422

Holley 550-1422 Terminator X Max, 2007-12 Gen III Hemi, EV1

Ignition Type:

Gen III Hemi Coil-on-Plug

Injector Connector:

Jetronic / Minitimer (EV1)

Tuner Style:

Touchscreen Handheld

$2,399.95

/kit

$2,587.95

$269 Off

Holley |

#4255501508

Holley 550-1508 Terminator X Max, 11-12 Coyote Ti-VCT, EV6, DBW

Ignition Type:

Ford Coyote

Injector Connector:

USCAR (EV6)

Tuner Style:

Touchscreen Handheld

$3,499.95

/kit

$3,768.95

$269 Off

Holley |

#4255501510

Holley 550-1510 Terminator X Max, 13-15 Coyote Ti-VCT, EV6, DBW

Ignition Type:

Ford Coyote

Injector Connector:

USCAR (EV6)

Tuner Style:

Touchscreen Handheld

$3,499.95

/kit

$3,768.95

$269 Off

Holley |

#4255501512

Holley 550-1512 Terminator X Max, 15.5-17 Coyote Ti-VCT, EV6, DBW

Ignition Type:

Ford Coyote

Injector Connector:

USCAR (EV6)

Tuner Style:

Touchscreen Handheld

$3,499.95

/kit

$3,768.95

$187 Off

Holley |

#4255501600

Holley 550-1600 Terminator X GM Gen V Early LT Kit

Ignition Type:

Factory GM

Tuner Style:

Touchscreen Handheld

Throttle Style:

Cable Driven

$2,749.95

/kit

$2,936.95

$187 Off

Holley |

#4255501601

Holley 550-1601 Terminator X GM Gen V Late LT Kit

Ignition Type:

Factory GM

Tuner Style:

Touchscreen Handheld

Throttle Style:

Cable Driven

$2,749.95

/kit

$2,936.95

$244 Off

Holley |

#4255501610

Holley 550-1610 Terminator X Max GM Early LT, Trans Control

Ignition Type:

Factory GM

Tuner Style:

Touchscreen Handheld

Throttle Style:

Cable Driven

$3,299.95

/kit

$3,543.95

$244 Off

Holley |

#4255501611

Holley 550-1611 Terminator X Max GM Late LT, Trans Control

Ignition Type:

Factory GM

Tuner Style:

Touchscreen Handheld

Throttle Style:

Cable Driven

$3,299.95

/kit

$3,543.95

$244 Off

Holley |

#4255501621

Holley 550-1621 Terminator X Max GM Late LT, Drive-by-Wire

Ignition Type:

Factory GM

Tuner Style:

Touchscreen Handheld

Throttle Style:

Drive-By-Wire

$3,299.95

/kit

$3,543.95

$269 Off

Holley |

#425550655

Holley 550-655 Dominator EFI Kit, COP Main Harness, Ford, EV1

Data Acquisition Replacement Component Type:

Dominator ECU - ECM - VCM

Sold in Quantity:

Kit

$3,499.95

/kit

$3,768.95

$138 Off

Holley |

#425550929

Holley 550-929 Terminator X Max LS1/LS6 MPFI Kit

Ignition Type:

Factory GM

Injector Connector:

Jetronic / Minitimer (EV1)

Tuner Style:

Touchscreen Handheld

$1,999.95

/each

$2,137.95

$138 Off

Holley |

#425550933

Holley 550-933 Terminator X Max 58X/4X EV1 LS MPFI Kit, DBW

Ignition Type:

Factory GM

Injector Connector:

Jetronic / Minitimer (EV1)

Tuner Style:

Touchscreen Handheld

$1,999.95

/kit

$2,137.95

-5%

Holley |

#425550936

Holley 550-936 Terminator X Universal MPFI Kit

Ignition Type:

Universal

Injector Connector:

Jetronic / Minitimer (EV1)

Tuner Style:

Touchscreen Handheld

$1,599.95

/kit

$1,687.95

$138 Off

Holley |

#425550942

Holley 550-942 Terminator X Max Universal MPFI Kit

Ignition Type:

Universal

Injector Connector:

Jetronic / Minitimer (EV1)

Tuner Style:

Touchscreen Handheld

$1,999.95

/kit

$2,137.95

$138 Off

Holley |

#425550950

Holley 550-950 Terminator X Max Universal MPFI Kit

Ignition Type:

Universal

Injector Connector:

Jetronic / Minitimer (EV1)

Tuner Style:

Touchscreen Handheld

$1,999.95

/kit

$2,137.95

$163 Off

Holley |

#425550959

Holley 550-959 Terminator X Max Universal MPFI Kit

Ignition Type:

Universal

Injector Connector:

Jetronic / Minitimer (EV1)

Tuner Style:

Touchscreen Handheld

$2,199.95

/kit

$2,362.95

Showing 1 - 72 of 130 results

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Mercury Marquis Engine Control Modules

Ignition Type

Brand

Transmission Family

Availability

Discounts

Engine Family

Price

Customer Rating

Products

Holley 550-918T Terminator X Max LS2/LS3 MPFI Kit

Holley 550-926T Terminator X Max LS1 MPFI Kit

Holley EFI 550-601N HP EFI ECU And Harness Kits

Holley 550-602N HP EFI ECU & Harness Kit, LS1/LS6, NTK O2

Holley 550-625N 2013-2017 Ford Coyote Ti-VCT HP EFI Kit, NTK O2

Related Articles

Holley 550-909T Terminator X 24X/1X EV1 LS MPFI Kit

Holley 550-916T Terminator X Max LS1 MPFI Kit

Holley 550-903T Terminator X LS1 MPFI Kit

Holley 550-905T Terminator X 58X/4X EV6 LS MPFI Kit

Edelbrock 35712 Pro-Flo 4 ECU/Harness For Gen IV 58X LS Engines

Holley 558-127 EFI Benchtop Harness, Firmware, Dash, ECU Testing

Holley 550-1218 Terminator X, Ford Modular 4V, EV1 Injectors

Holley 550-1219 Terminator X, Ford Modular 4V, EV6 Injectors

Holley 550-1220 Terminator X, Ford Mod 2V or 4V, Smart Coils, EV1

Holley 550-1221 Terminator X, Ford Mod 2V or 4V, Smart Coils, EV6

Holley 550-1225 Terminator X, 2007-13 Gen III Hemi, EV6 Injectors

Holley 550-1312 Terminator X Max, 13-15 Coyote Ti-VCT, EV1, 4R70W

Holley 550-1315 Terminator X Max, 15.5-17 Coyote Ti-VCT EV6 4R70W

Holley 550-1316 Terminator X Max, Ford Modular 2V, EV1 Injectors

Holley 550-1319 Terminator X Max, Ford Modular 4V, EV6 Injectors

Holley 550-1422 Terminator X Max, 2007-12 Gen III Hemi, EV1

Holley 550-1508 Terminator X Max, 11-12 Coyote Ti-VCT, EV6, DBW

Holley 550-1510 Terminator X Max, 13-15 Coyote Ti-VCT, EV6, DBW

Holley 550-1512 Terminator X Max, 15.5-17 Coyote Ti-VCT, EV6, DBW

Holley 550-1600 Terminator X GM Gen V Early LT Kit

Holley 550-1601 Terminator X GM Gen V Late LT Kit

Holley 550-1610 Terminator X Max GM Early LT, Trans Control

Holley 550-1611 Terminator X Max GM Late LT, Trans Control

Holley 550-1621 Terminator X Max GM Late LT, Drive-by-Wire

Holley 550-655 Dominator EFI Kit, COP Main Harness, Ford, EV1

Holley 550-929 Terminator X Max LS1/LS6 MPFI Kit

Holley 550-933 Terminator X Max 58X/4X EV1 LS MPFI Kit, DBW

Holley 550-936 Terminator X Universal MPFI Kit

Holley 550-942 Terminator X Max Universal MPFI Kit

Holley 550-950 Terminator X Max Universal MPFI Kit

Holley 550-959 Terminator X Max Universal MPFI Kit

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