Great job Ron!
Couple of notes, for a center diff upgrade, you may want to add in the 5mt DCCD from STI/RA transmissions, and locked center diffs with rear bias like the Cusco Tarmac.
It's taken too long to get good info on diffs for our cars. AWD is the core of Subaru's success, and more people on this forum know more about turbos than they do differentials! Great job.