Here is a few more space saving ideas. The new ECU was just a little larger than stock.
So I added a shit load more stuff to it. Mounted everything on a fold down panel for service. The rear of the panel has boost solenoid, boost sensor for LC2 wide band, AEM meth control and all the vacuum lines and crap the would have been under the hood. This ECU has a built in 4 bar map as well. So it needed vacuum down there anyways. The original ECU pocket was used for extra line storage as all this stuff come with more length of cable than anyone would ever need.