Hmmm. I've been thinking about adding an intercooler to my truck too. I was driving it last night in about 15 degree (F) weather, noticed a little more power at WOT than usual, and boost was getting to 12psi max, instead of 10 or 11 where it usually sits. Getting that colder air charge must do something...
Then again, maybe I should fix the secondary glow plug relay first... It started this morning at 5 F, but not real happy about running for the first 30 seconds or so.