crank case evac

i don't know what crank case evacuation is or does but I have heard this build performance. so my questions start with the usual.
is this safe for a daily driver (will it screw up my car?)
is it practical (hp gains vs money)
is it good for dsm's and will this help my other mods do their job?
how it works
thanks in advance for any help :smile:

I don't know what that term means, but it sounds a lot like PCV, Positive Crankcase Ventillation, and our cars already use a PCV valve back into the intake.

I think this might be a seperate system though, (dunno) some kind of add on. My friend was talking about it but I was too busy staring at our waitresses tail to pay attention ( damn I love hooters) I think he said it creates a huge vacume (spelling is not my hobby) and allows for higher rpms. ( don't understand how) if anyone else knows this, I am very interested, anything involving hp :p