I've posted before how I do it.
I run the PCV and pan evacs. At idle I have the PCV pulling crank case vacuum, with a little help from the pan evacs. At cruise both pull. At WOT it's just the pan evacs.
I do not pull in fresh air. It's a sealed system. I could have run a vacuum pump but there is no room for it. And this is actually a much more simple deal.
