I used to have a DC Ceramic 4-1 header back in the day and that thing "POS" rusted slightly on me. Then one of my buddies (for some reason) went out and bought one also had the same damn thing happen to him. I think it rusted because I live only 10 minutes from the beach so the salt content in the air will be higher than Montana. Personally, if you are worried about your header getting banged up or rusted to shit, then if I were you I would just get a JDM 4-1 R header, wrap it up, and get the upper and lower heat shields for it. That way under hood temps will be down, you will have a monster 2.5inch collector, and best of all it will look factory!!!!!!!!!! sleepy sleepy.
Milan