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					Originally Posted by  sperry
					 
				 
				Is that thing as tiny as I think it is?  It doesn't screw into the crank breather on the top of the block does it? 
 
I've got a massive GST donkey-kong barrel AOS on my WRX... if this does the same job, that's mighty impressive. 
			
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 It is a blatant copy of the Prova A/O Separator with an extra input line added:
http://www.iwsti.com/forums/how-inst...separator.html
The extra line input makes it superior to the Prova in that it has inputs from both the crankcase and the valve covers.  I personally would be skeptical that turning the oil filler tube into the equivalent of a catch can that drains back to the driver-side valve cover is equal to systems by Element Tuning, Crawford, and Pro-Vent, but maybe.