Originally Posted by PearlRex11
There is always blow by. I was referring to excessive blow by, thought that was obvious, which would warrant using a catch can. I remember reading about someone using a company that makes them to whatever spec you want and for cheap. Imo catch cans are overpriced, there really isn't much to them. An EVO that goes to our weekly meet has a yellow rockstar can as his catch can, it's actually well executed and looks pretty cool.
Ok, I know that there is some because of the design (blow-by), my car is almost 3 years old and the bottom of the TB is diry but doesn't look like oil. the inside of the couple is the same way (its greasy/oily to touch but not physical oil deposits).
I didn't think there is a ton of design in these things other than using baffles instead of the old steel wool designs.