Suggestion on what to buy
do you have a evo 8 or 9? if you have a evo 8 just get the metal evo 9 bov, if you have a evo 9 keep your stocker. you could also go with a aps dual port, turbo smart dual port if you want the swoosh sound but keep your drivability. as for the manifold i would go with a ported stock exhaust manifold from ppi, buschur, etc. youll make better gains with a ported stock manifold than the majority of tubular manifolds. now with the money you have saved you can buy alot more mods.
neither. keep the stock mani and have it ported/coated, you'll get just as good sometimes even better results from this over an aftermarket stock turbo manifold. as stated above, if you have an 8 just get an OEM 9 BOV or any MR unit. Unless you're making more power then the stocker can hold, BOV's are serious rice mods and can even hurt your performance if you buy the wrong unit.