Pacesetter headers can be a bit hit or miss. I have seen them fit fine, seen them hit the floor pan, and angle slightly down. More often than not, they are ok, but if you get bad ones it is a problem waiting to happen.
Stainless is a better idea than coating as others have stated. Think of coatings as paint, no matter how much prep you do or how good the paint you use is, eventually it comes off. Add the complication of heat cycling since it is exhaust and you can see why it doesn't last.
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