anyone install the above? what is the use and any good or just another snake oil ? 
you can install as it prevents oil from getting into your pcv line and clogging up your throttle body.
also, if your car is spewing out a lot of white smoke, it can help determine if engine oil has gotten into your exhaust system.
there are other uses, but instead of asking here and receiving some waste-time answers from i-know-everything-but-in-fact-i-dont, search the net for it bro.
cheers.