Made by one of the worlds experts in mil-specification harnesses; it’s an off the shelf solution for a reliable, motorsports level connection from the M4 engine management computer to your S14 engine.
Comes supplied complete with Raychem shrink tubing, Deutsch connectors, firewall bulkhead Mil-Spec connector, relay and fuse box, and all necessary connectors to install. Pre-lengthened for an S14 in an E30 M3, but can be spec'ed to accommodate most other chassis.

While very costly, this is the epitome of quality and performance available to the racer.