mine isn't filtered. I remembered this thread a while back when I was under my hood and I checked it. I can stick my finger in the hole where it comes out, downstream of the air filter. It looks like it goes thru the filter, but mine doesn't. Not trying to argue, just sayin......I don't have my truck with me now or I'd take a picture of it.
The stock intake does not filter the Crankcase vent/breather.
With S&B it is filtered before entering the engine's throttle body. If for some reason your crankcase is under vacuum and sucking in air, then it would not be filtered--Issac Newton would roll over in his grave however.
Regardless, this is gas from inside your crank case--no dusty/dirty/cootie filled air from outside your vehicle being introduced to your engine.
With Vararam it is vented to atmosphere through a filter. Air in, or air out , it is no longer attached to your engine's intake.
Below is the link to my S&B thread. You can clealry see the crankcase vent (small tube) enters the filter housing in the picture from under my hood. Even if it went straight into the intake tube going to the TB it doesn't matter, but it doesn't.
http://www.ramforum.com/f44/s_b_cai_moes-32698/
PCV line is entirely different and full of used motor oil vapor you want a BT Catch Can to intercept.
