My BBK JET coated headers have been on my car for like 3.5 years. My car has 130K on it and there isn't any rust on them at all. Parts of them have turned whitish but thats probably easily cleaned off if I bothered. The main part is that they haven't rusted. I live just south of San Francisco and about a mile inland so there is a lot of fog so they have withstanded the elements. In my opinion they are the best.
Kevin