Holley Terminator X Systems

The Terminator X Stealth 4150 EFI system from Holley features 4, 100LB/HR Fuel Injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications. The Terminator X ECU is capable of fuel map self-learning and...

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 engine, self-learning fuel strategies and the proven, race-winning technology of Holley...

Simplify your Electric Fan installation. No PCM required!!This is our new Fan Control harness and module for an easy, great-looking installation of single or dual electric fans. The fans are triggered by a thermal switch. We have standard NPT as well as...

Plug and play for Holley Avenger, Terminator, HP, and Dominator ECU fuel and oil pressure inputs. Features: Plug and play for both fuel and oil pressure inputs with Holley EFI systems (Terminator systems monitor fuel pressure only) Stainless steel...

The touch screen LCD provides a dynamic range of tuning and data monitoring options in a compact 3.5" LCD display Features: Full Color, Backlit 3.5” Touch Screen LCD Laptop-Free Tuning changes to help optimize mileage, driveability and performance...

Simplify your Electric Fan installation.This is our new Fan Control harness and module for an easy, great-looking installation of single or dual electric fans. This is a ground triggered harness, so it works out-of-the-box with Holley Sniper, Terminator...

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, self-learning fuel strategies and the proven, race-winning technology of Holley...

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 engine, self-learning fuel strategies and the proven, race-winning technology of Holley...

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 engine, self-learning fuel strategies and the proven, race-winning technology of Holley...

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 engine, self-learning fuel strategies and the proven, race-winning technology of Holley...

The part that Holley forgot! The Sniper Stealth EFI is a great system. It does a great job of converting a car to fuel injection while keeping that classic carburetor look. Unfortunately, Holley ships these systems with some really oddball fittings...

The 558-456 wiring kit is intended to fully populate all of the inputs and outputs for PNs 553-111 and 553-112 Pro Dashes. These can easily be inserted into the existing 34 pin dash connector. It contains loose wires and 2 and 3 conductor cable (jacketed...

Designed to plug and play with HyperSpark distributors and Holley EFI main harnesses with an ignition connector, such as part number 558-104. Features: Used to run a "timed sequential" fuel strategy, with Holley EFI V5 Build 160 or Later, or Terminator...

Have you been searching for a reason to discard your old noisy mechanical speedometer cable? If so, the Holley GPS Module for our 7" Digital displays should be the next addition to your project vehicle. Featuring a simple plug and play installation, this...

06.05.24IT'S BACK!This system has been put back in to production by Holley! We now have them available for sale again!Take control of your 302ci Small Block Ford engine in your Fox Body Mustang with Holley EFI Terminator X system! Don't settle for the...