lol at you guys.
you guys are missing the obvious point that the surface area of the front of the intercooler is but a tiny fraction of the heat transfer surface of the IC as a whole. most of the heat transfer is INSIDE the core, not on the FACE.
anodizing it would not be a good idea, because most likely the part will be totally immersed and coated.
just use spray paint and spray the front. try not to let it get too far into the core.