I wouldn't just block the pcv like that.
I don't mean to insult anyones intelligence, but there is a fair bit of misconception on the pcv valve. When the car is off boost, the intake manifold is under vacuum, which then sucks crank gasses through the pcv. The system needs fresh air though, which comes from the intake pipe. So off boost the air travel looks like this air->afm->intake tube->cam cover->crankcase->pcv->intake manifold.
When you are on boost, the pcv shuts, and the flow actually reverses. So you will get the crankcase gasses going back out the valve covers into the intake tube, to the turbo and into the manifold that way.
Now if you just block the pcv off, when you are off boost you won't be venting the gasses. You would need to add a vent to the valve cover or to the catchcan to vent the gasses off boost. If you don't, a lot of that fuel vapor will just sit around in the crankcase getting absorbed in your oil. The pcv is not that bad, as like I said it only vents to the intake manifold off boost. Yes you will get some oily vapors, but not that bad. And it's pretty efficient way of evacuating the crank vapors. On boost you will get a lot more crank pressure/vapor, which is where a catch can is much more important.