No.... I have one hose going to PCV and one hose to plenum. With the Cusco, i dont think it matters which side goes to where, you can do either, as long as you do both.

I would not plug the plenum hose, but it doesnt really matter. Why not get some mo air back into the plenum? I realize what they did with just letting the air vent to atmosphere through a breather filter, but why not just feed it back into the plenum? The guy with the Greddy had a great idea, with one hose per valve cover feeding into the can and letting the air vent out, though, but he is also prob FI which his setup is more venting (directly from each valve cover) than an N/A car really needs.

If N/A i would just run the hose to the plenum as well, we can take all the air we can get.

BTW, what is that small hose going into the top front of your plenum? Mine is capped off.

 

This is the same setup and location i have.