I've been driving tuned for 6k miles and was stock for 2k.

The two parts that generally fail are the PCV valve and the diverter valve. These fail even on stock cars, however. You're just significantly increasing the chance one of them might go. Lots of people run the life of their car, even tuned, with the stock PCV and DV.

I'll see if I can post up a stock vs.giac(old file) boostlog.