I know how to do the catch can, if you notice they plug off the second vent on the driver's side valve cover. I would think you still would want to use the vent to relieve pressure especially since a lot of us are running more boost then stock. I have a oil catch can that has a filter on top, different then the one woody designed which reattaches to the throttle body and helps create vacuum in the system. My JAZZ set up I'm doing a little different. I'm blocking off the throttle body and running all PCV venting into the can.