One or Two Breathers

You need to use the pcv valve.Why would you not want to use one.I can tell you from my experience from not using one it caused all kinds of oil leaks.Had to replace valve cover gaskets,intake gaskets and rear main seal in my engine because i did not use one from building up pressure in the crank case.Look at it this way it is not going to hurt to run one but it sure can hurt your engine if you do not