Hello and thanks for your time. I have a 87 Turbo II. Im installing a oil catch can and cleaning up engine bay. Ive looked online as best i can but cant find a specific answer. Ive read running open breather is fine for crankcase pressure, but the lack of airflow will keep the bad fumes and crud inside the engine and cause sludge. Do i need to keep the PCV valve itself if im running from the valve cover, to a catch can and going into the breather port on the air filter box? My theory is the vacuum from the engine is ok enough to pull the stuff out. I dont think thered be enough vacuum to cause excessive negative pressure in crank case, as it is before the air filter. Is this a viable set up or is this set up totally useless?