unless you have a power adder, and even then you can normally still run a PCV. The reason people remove them is they get excessive blowby. which is normally caused be crankcase pressure under boost. It also happens if your PCV valve/system is clogged up. Not running it leads to all sorts of nasty things like excessive oil in the intake and burning oil, poor driveability. Make sure the screen and rubber piece are intact in the lower intake, get a good PCV and hook up the hose to the upper intake port as Mike showed. Also, do not run an open breather element as you will draw in unmetered air .
Are you blowing out the diptstick, seeing blue smoke or smell oil burning?