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make your own intake.. if not, atleast do the cone filter mod.. it's cheap, doesn't hurt, and makes a cool suction sound. .even for na cars. try it out.
heat shield would help. i have an ebay intake on my 2.8 without a heat shield and on a hot day i get tons of heat soak... but im just too lazy to make one so no its not completely necessary but it is definitely worth it