Do you guys put anything in them? Like steel wool or that shower puff thing? Or do you leave them empty? I was not sure if putting some stuff in there would help hold more of the oil in the vapor inside the can instead of it coming out of the breather.

 

Hmmm, sounds like a good idea. Should work in theory. I'm going to do this when my ebay catch can gets here. Thanks for the hint.
BTW, I'm leaning towards steel wool. A loofa sounds kind weird to me. Especially with vapors that have the temp of the cylinder head going through it.

 

ttt