UltimX

I have a couple of questions, I searched but didn't find much info so i'm writing here. Is it possible to swap the cold side wheels for the hot side wheels? if not, why? Also, do they make aluminum hot sides? if not why? I know it will disperse heat quicker than cast but it will also generate heat quicker as well. Which turbos have the .48 hot side besides the merker, svo, and tbird? Thanks guys