yeah, except you spend very little of your time in boost, and a vst majority of time in vac conditions...with a pcm that adjusts fueling while at low TPS% (ie vac) for both low rpm and high rpm AFR.
so really its not good, just delte pcv system and run the filter and change your oil far more often, or keep the pcv system and plub in a fresh air supply from behind the maf, but in front of the throttle blade, and you will no longer have any tuning issues.
ive run the breather, its a pita, 10 minutes of work and for less than the cost of a breather you can retain oem type pcv operation.