see, the greddy catch can is hollow - thats right, nothing inside it. so basically it lets air go from one tube to another, not filtering anything out. so to solve this, i put some brillo-esque steel pads in there to create some sort of baffling to disturb the air and give it more surface area so it would "catch" the oil vapers in the air.
but there was still a problem - since the inlet/outlet points on the can are right next to eachother, the air just goes right above the brillo pads and doesn't even reach the bottom of the can.
solution: take a clear vinyl tube about 4-5 inches in length, cut tip to fit, then insert into one of the tube openings- either the one will work fine. here is what mine looked like