Lse9x Holley Terminator x Max Swap Harness Bundle

dLSE9X Holley Terminator X Max Swap Harness Bundle

A Simplified Wiring Solution for LS-Swapped E9X & E8X BMWs

Click here for harness installation guide

If you’re swapping an LS engine into your E9X or E8X BMW, this bundle takes care of one of the biggest headaches—wiring. The LSE9X Holley Terminator X Max Swap Harness Bundle includes everything you need to run a Holley Terminator X Max ECU while keeping your BMW chassis electronics working properly.

At the heart of this setup is the Summer Industries E9X LS Swap Harness, designed specifically to integrate a Holley EFI system with your BMW. It’s pre-wired for our LSE9X CAN box, allowing key BMW functions—like the gauge cluster and CAN-based controls—to work smoothly with your LS swap.

What’s Included?

Summer Industries E9X LS Swap Harness – A high-quality, pre-configured engine harness built for the Holley Terminator X Max with:

• Dedicated sub-harness for crank & cam sensors, compatible with both Gen 3 and Gen 4 LS engines

• Injector sub-harness for EV1 or EV6

• Pre-wired drive-by-wire throttle body connections (6-pin DBW)

• Single chassis-side connector for easy BMW integration, with wiring for:

  • Ignition signal input

  • Brake signal input

  • Drive-by-wire throttle

  • PT CAN connections for the LSE9X CAN box

  • Cooling fan output

• Pre-wired fuse box providing protected power for the ECU, fuel pump, and starter circuits

• Power and ground terminals designed to connect to the BMW strut tower with an internal 40A fuse

• Injector sub-harness tailored to your setup (e.g., EV6, EV1, or others)

• No transmission wiring included - Ability to add one Holley Transmission harness.

Holley Terminator X Max ECU – A proven LS engine management system that includes:

• Self-learning fuel tables for easier tuning

• Support for drive-by-wire throttle bodies

• Holley EFI software support for real-time tuning and diagnostics

LSE9X CAN to BMW Conversion Box – The key to making your BMW gauge cluster and electronics work with Holley EFI, providing:

• RPM, coolant temp on the factory BMW cluster

• PT CAN communication between the Holley ECU and BMW chassis for things like AC control and wheel speed for configuring traction control

Built for a Clean, Straightforward Installation

This setup was designed to keep things simple and organized. The Summer Industries E9X LS Swap Harness is made to fit cleanly in the factory DME box, with properly routed harness lengths to match the BMW engine bay layout.

Why This Bundle?

• Easier BMW chassis integration – A single chassis-side plug means minimal wiring work (instructions included and matches our swap video)

• OEM-style fitment – Harness lengths designed for a clean install in the BMW’s factory DME box and engine bay

• Supports different LS setups – Includes injector harness options and cam/crank adapters

• Time Saving – No modifying, relooming, and adding to your harness to wire up your swap

Please Note:

• This Harness is NOT plug and play with the bmw chassis connections.  It has a single 12 pin connector with all the connections that must be made to the BMW chassis as show in our swap videos and tech articles.
• NO 3.5" screen or tuning cable included
• NO widebands sensor included. Uses a 4.9 sensor.