I'm using a thing called a "krankvent" it's supposed to hold back like about 75 psi if I remember correctly, so I'm still using the pcv system off boost. They come in a couple of different sizes. It costs a little more money than an aquarium valve, but then again last time I checked my engine is worth more than an aquarium. I've got it setup right after the pcv valve in the picture. On the valve cover on the other side of the charge pipe, I'm just taking in a little atmosphere air. I don't even need a catch can and I don't blow any oil out of that tube either. Yeah, I was shocked at that one too, but that krankvent is fast and seals perfect.