This is what I did today, installed a catch can on the fresh air side, same catch can that is on the PCV valve side. I'll start by answering questions you have not asked, #1 why?
Because with the AFE 6.4L air tube, the PCV air tube comes in at the throttle body, it will pull more vacuum from there and I don't want oil showing up on the throttle body air plate. Which if it gets that far it will also get to the supercharger bypass air plate control as well.
The catch can itself is two way air flow, but only captures oil on the IN side of it, but allows air flow back in the opposite direction when the engine needs to pull in fresh air.
#2 How am I going to dump it?
I can either siphon oil out through the dip stick hole, or simply remove it, dump it and then replace it. It should be a really slow fill on this side anyway, but where the tube is located at the throttle body may affect that with higher vacuum.
I'll pretty it up later but it looks good and 100% functional in its location.
I used heavy nylon duct ties to secure the catch can to the Magnuson reservoir, and I used pre-formed hose to make the connections. Works Great! Ry