Researching further on this topic on other turbo platforms (vw/audi) seem to suggest that vacuum provided by the turbo (so in our case the rear intake tube where the stock PCV hooks onto) is a great source of vacuum and basically a free vacuum pump every turbo car comes with
In any case this PCV on the N54 definitely needs some research/testing especially as we run high boost/upgraded turbos...crankcase pressure gets really evil up there and if at the minimum the stock checkvalves aren't working as they should it can wreak havoc in various places