It seemed that my uppipe might have been cross threaded from the factory maybe, thats what they think at the shop. Im running a slightly larger diameter aftermarket one now, supposedly helps with my spool. They would have had to change the studs in the stock up pipe because they were too short anyways, but apparently not all of them are like that. 750cc injectors should also do you just fine. Im running slightly over 60% if I recall on 20 PSI. Also start looking for some type of better splitter for your IC also, the stock splitter is useless now. Im taking mine off tomorrow, either going to eventually get a zerosports one, or make my own when I have the time to do it in my shop. Try and save up some cash for a 3port BCS and maybe (not absolutely needed) a BPV. I run the Perrin unit, its awesome (a few minor issues, but I have them resolved now, just not going into it here).
Srninjastar if you have any other questions about my setup and the ups and downs of it just PM me.
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX