Currently picked up a 03 8 shell. Most of the wiring is there. A bit of it was cut out trying to figure what exact bit that wiring went to & if anyone was selling.

currently needing that bit of the wiring harness & engine along with ecu

 

A bit hard to tell from the photos and since I don't have my car in front of me, but it looks to be in a similar location to where the intercooler sprayer wiring would be. If the reservoir/pump was removed, it may have been cut. Have you looked at the factory service manual?

 

If needed you can find the manuals, including the wiring manual, here: http://www.evoscan.com/vehicle-manuals

 

That looks like a nightmare...

Personally I'd spend the $200-300 or so a piece on a new engine harness and dash harness that weren't hacked up by the previous owner...