i use to pcv valves, the original which had a vacum pipe goin from that to the catch can then another one goin from the catch can to the inlet manifold has can be seen in this pic posted by weejohn from tgtt http://www.toyotagtturbo.com/forums/showth...highlight=catch my catch can gets full of mucky oil now has wen i had it the other way like posted above it done nothing, dont forget u have to have a breather on the rocker cover aswell