I'm not sure on regular shorties. I have Edelbrock TES headers that I sent to High Performance Coatings and had them coated.
From what I read, the coatings on already coated headers are not as good. Just from what I've seen others say about theirs starting to get surface rust on them. Of course this was the cheaper coated headers.
I recommend buying the headers you like and not some cheap crap. Then send them off and get them coated inside/out. Of course this ain't cheap, but it will last.
You get what you pay for. If your truck is something you are planning on keeping for a long time, spend the money now. You'll be glad you did down the road.
Mike
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