Contact the guys at Swain Technology. They have a black coating specifically for heat exchangers. This is what I used on my FMIC, as I wanted to make the IC less obvious from the cops.
http://www.swaintech.com/race.html
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91 Z32 TT, 92 Z32 TT, 90 240 LSX, 09 GT-R, 18 Honda Ridgeline
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