I got mine with the coating. They where installed for two years before I ever started and drove it and they turned to rust. My brother had a set of Dougs headers that did the same thing. They looked good the first year. Maybe in a dryer climate they would hold up better but I didn't have any luck.
I'm trying a 2000deg paint from KBS this time around. To soon to tell how it will hold up. But it hasn't burned off or blistered yet in the 6 times I have had it out.