I spent some time on the phone with Gene (owner) at ME Wagner this morning. Super nice guy. He's done a bunch of research on PCV systems and has recently done some work on the effects of size of breather on the effectiveness of the PCV system. This is a question I've been trying to answer. Gene agrees with Brent, who told me not to run a smaller breather on the driver's side, like this one:
https://www.holley.com/products/plum...rts/3434112ERL.
Right now I'm running a larger K&N breather, but may convert it to a closed system with a larger hose, which should breathe even better. The key point here is that the fresh air side does matter, and you want as much flow and filtration as you can get.