Sale

Ignitions and Electrical› Computers, Chips, Modules and Programmers

Holley

Engine Management System Terminator X

$1,687.95 $1,535.95 Save $152.00

SKU: H00E 550-903

In Stock
In Stock
Ships by Jun 7
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The Holley 550-903 Terminator X 24X LS MPFI Kit offers complete engine control, self-learning fuel strategies, and Holley EFI technology for GM LS1/LS6 engines with a 24x crank reluctor and EV1 injectors. It features real-time fuel map learning, high impedance injector drivers, an integrated 1bar MAP sensor, and 4 programmable inputs and outputs, along with a 3.5" touchscreen handheld for easy calibration and tuning.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandHolley
Part NumberH00E 550-903
Weight9.2 lb

Videos

How To: Install Terminator X EFI on any LS Engine

How To: Install Terminator X EFI on any LS Engine
Don't Buy A Holley Terminator X Before Watching This Video

Don't Buy A Holley Terminator X Before Watching This Video
Terminator X EFI for LS Engines

Terminator X EFI for LS Engines
Reviewing Holley's Terminator X EFI

Reviewing Holley's Terminator X EFI
Terminator X Full Install and Overview

Terminator X Full Install and Overview

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy