I'd guess it at being from the PCV valve to the catch can inlet and then the hose from the catch can outlet to the intake manifold. Since the liquid oil is heavier than air, it'll just drop into the can whilst the air just slide through.
Is there any disadvantage to this? I'm assumign that this will most likely be a good mod for the kids who actually have something besdies a stock engine? Although, I've seen the inside of my intake manifold and that bitch is black

I guess it's the oil

Damn you oil.. damn you...
Aside from pulling the intake manny off, is there any other way to clean it? I Seafoamed not to long ago but I don't really see seafoam cleaning that gunk mess
P.S. Is that breather filter the same thing (job-wise) as a catch can? Catch can is fancier looking though

defintely sweet to look at to show your fellow ricers

LOL!!! Kidding, kidding!!!