Taking a chunk of wire out of the harness did improve matters for me, but not quite enough and more needs to come out. This time, however, it’s extra plugs that are being removed.
One of the recommendations on the forums was to create an adapter harness to go between the A4 and A6 plug mapping so you don’t have to cut up the 2.7T harness. This seems good in theory, until you realize you need to cut into the harness upstream of the A6 plugs anyway. The adapter harness really just ends up being a bunch of extra plastic bulk that won’t fit into the plenum chamber (and you need to make sure that’s closed so the ECU and/or your feet don’t get wet).
Started with the slow process of cutting individual wires on either side of the A6 plugs and immediately reconnecting them. Doing it one at a time made it easier to organize the wires by plug. By grouping the wires together I hope to better bundle them to save space.
A short 6 hours later the majority of the extra plugs are removed and the wire rearranged. I can now fit the TCU and ECU both into the plenum box. there is, however, still a long way to go to tame the rat’s nest enough that it will fit back into the plenum box.