I just hooked one of those wire brushes to my drill and sanded it down. But be careful in the process, thats how I broke my radiator!! lol 
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05 Srt4
Agp 3147 w/supporting mods
97 Mx-5
T28, hks man, ebay int/pipes, rfl bov, xtd 6 puck, 3" magnaflow, msd timing box,
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