Just got my '11 Roadster back together after having many of the shiny bits powder coated / ceramic coated:
I also drilled some vent holes to the bear claw in preparation for triple filters, and to exhaust heat shields for no good reason whatsoever.
A word of advise to anyone considering drilling the exhaust heat shields though: they're stainless (who would chrome stainless -- apparently Triumph does). I realized this only after going through one titanium nitride drill bit just to drill a pilot hole. Definitely have some cobalt drill bits on hand before starting the job.
Anyhow, I would estimate all the added blackness will make the bike at least 10-15% faster