ok got my new wrx on tuesday ;D so i've had it a week wanna fit a hks b.o.v. but i've read if i do the engine runs rich after the dump but i really want one instead of that plastic thing, also a straight through muffler without the cat any recomendations and any power increases would be nice even though theres enough already but i don't wanna ruin my warranty what can i do? Also i live in the uk and understand that getting some parts may be hard so? ???