ha i didn't think of it that way...but anyway plugging into the intake manifold would become boost and close the pcv valve, but before the turbo would be constant vacuum, at least that's what i thought. i have researched pcv setups on turboed cars and some people say to use the pre-turbo vacuum source, and some people say that it's fine to use the stock setup. the pre-turbo setup just seemed safer to me.