i read something similar on a search thru another forum. they were really torn on the idea tho questioning whether or not it would affect its function.
one person recommended engine enamel
another says heat proof paint and dont forget to a give the intercooler a light rough up with a wire brush or green scotch pad and then wipe with prepsol
another says anodized black paint
another forum had a few suggestions...
rust-o-leum
annodized
"radiator black"
enamel paint
someone mentioned SCC did a piece on sleepers and they dyno'd before and after painting the IC showing no effects in performance...
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New goal...  yea its an M3! 
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