the breather on my scirocco 16v seems strange. it goes from the block, just behind the oil filter, to my airbox, but there is a segment that diverts to what looks like my cold start valve or something on my manifold. well i could just put a filter on the airbox end of the hose, and plug the hole in the airbox, but what about the segemnt that diverts to the manifold? does it need vaccum or something? why is that connected to my breather hose?