Need some opinions. On the new ITR 300zx I am building I need put in a catch can for oil. Evidently the stock PCV design is bad and has the tendency to dump a lot of oil into the plenums, especially when raced or run hard.

So My question is:

Should I just vent the crankcase lines (there are two on the zx) into an open catch can and plug up the PCV valves?
And is there really going to be an issue with having an open line like that? Some opinions are that you are creating a "intake leak" by not keeping it a closed system.

Or do I need to keep the system as is, and add an oil separation can and keep the PVC valves as is.

Personally I never had any issue running the system open in the 240sx, and would like to keep the oil from having any route back into the intakes.

Thanks.