Living in wintery North Dakota conditions, I have to deal with the moisture/PCV related issues that plague our cars during short winter trips. The consensus seems to be that a catch can is the best solution. Well a catch can is a PITA, it needs to be continually emptied, and your dipstick needs to be checked very frequently(for the record I do check mine every fillup) so you don't run out of oil, because the can does what it is supposed to do it catches everything(mostly).
There is a better solution though, its called an air/oil seperator, the STi boys have them, why don't we? Well I have emailed Crawford Performance(they built Ken Block's vehicles), and they are willing to develop an AOS for us, if they have enough buyers. For those of you that don't know what an AOS is or how it works, there is TONS of info out there just check out a subie forum, but the link below is a pretty good place to start. If we can get enough buyers for Crawford, they will do the appropriate Research/Development so that it works as flawlessly on our GTi's as the STi's.