J2534 ECU Harnesses for EASE Off-Board Adapter

Add durability and reprogram with confidence using EFI Connection ECU programming harnesses. No more accidental wire placement and bent pins. Our harnesses feature a DB25 connection to the EASE Off-Board Adapter. 

Tuning Software Packages

We offer two Scan & Tune Packages, EFILive and HP Tuners. They each offer tremendous value.

EFI Engine Control Modules

Choose from popular GM electronic fuel injection ECMs or powerful aftermarket ECUs. Many ECUs are supported by our 24x and 58x systems.

Transmission Control Modules

A Transmission Control Module (TCM) is required for GM 4-speed and 6-speed automatic transmissions when using a 58x-equipped engine with a GM Gen IV LS-Series ECM (like E38 or E67 ECM).