This is my current setup. UPR catch cans with check valves on green and yellow lines to prevent blow back into valve cover. CFM oil cap breather, under vacuum check valve is closed and doesn't allow air in but when crank case develops positive pressure the check valve opens and allows the positive pressure to vent.
I've had good results with this setup.
-PCV is still in tact allowing a vacuum to be pulled on the crank case during normal driving (which is good)
-Long hose routing and double catch cans gives time for oil to drop out of the air
-Double check valves on PCV lines ensure no positive pressure makes it way back to the valve cover/crank case
-Any positive crank case pressure is vented by oil cap breather
I've had good results with this setup.
-PCV is still in tact allowing a vacuum to be pulled on the crank case during normal driving (which is good)
-Long hose routing and double catch cans gives time for oil to drop out of the air
-Double check valves on PCV lines ensure no positive pressure makes it way back to the valve cover/crank case
-Any positive crank case pressure is vented by oil cap breather