I could be wrong, it has happened before, but I didn't think anything on a Harley was cerakoted by the factory. And from your picture I can't tell what part you are talking about. Heat shield, exhaust pipe, clamp?
Sometimes its better to keep your mouth shut and be thought a fool than to open it and remove all doubt.
“We all know that light travels faster than sound. That's why certain people appear bright until you hear them speak.”