Its possible but it depends on demand.
To make stainless headers is nice but if you are coating them why go stainless?
Depending on what grade stainless it can still rust. Also it costs more and is harder form.
We went non stainless as for the headers it cost about half the cost for stainless and you can have them coated to last longer and be better thermally.
I can understand the cost point but in the long run stainless last longer. OEM exhaust on just about all new cars is stainless to deal with emission warrenty rust through issues. I have had three sets of coated headers, two from "factories" and a custom set from Jet Hot, they all have pitted in less then 3 years. If the coatings were great the big 3 would be using them
You are correct, even stainless will rust but you dont have to worry about it rusting from the inside out ( from under the coating)
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