So there is the line from the PCV plate going to the catch can and then the other line comes from the valve cover breather. That's the way I assume he has it plumbed. Notice he has a petcock for draining it when it's full. He doesn't want any of the oil going back into the motor. So that means the catch can is the last place the oil goes. Also, you could easily do this on a stock 2.0L. You might need a custom tune to account for the valve cover breather air not being recirculated, though.
1992 Eagle Talon TSi - sold (POS)
2002 Mustang GT - sold
2002 SVTF - sold
2008.5 Mazdaspeed3 GT - cursed
2003 350Z Track - basically stock, and it runs