new design vs old valve cover and pcv?
 

Does anyone know the difference about the old vs the new design for valve cover ?

I don't know if i have the old one but i bet so as i got it at 8700miles and never replaced it.

I bought a replacement cover to polish it and before i put it on i would like to know if there is something i should do to improse breathing of the crankcase under boost from the cover ?

I was looking to oversise the holes behind the metal plate to let more air to pass thru but in other hand it is caped by the tole itself on each compartment to keep the oil from going out...Do someone already made improvement there?

Its different where tube comes out for PCV
1st pic old
2nd pic new

i have both old design :(