B5QShip

Why are many of these even necessary? For example, the PCV system has 2 connections, one to the intake manifold and one to the Y-pipe. Blow-by goes to the intake manifold under vac and to the Y-pipe under boost. Why not just always send it to the Y-pipe? Same thing with the activated charcoal loopie deal. Obviously some are necessary (like for the N249 vac reservoir), but some seem pointless. Can someone enlighten me?

jprice@CPS

By having it go to the intake manifold under vacuum, that significantly reduces the amount of your oil in your intake.