alright i have an 05 gtp. its got 3" downpipe, power log, ported rear manifold, K&N FIPK intake, ceramic coated crossover pipe. i will next be getting a tune and an 180* t stat. what plugs should i run on this setup? i was looking at ngk but the safely modding your grand prix said not to unless you have a smaller pulley which i dont have yet. any advise?