>
> "Haywire" <haywire@telus.net> wrote:
> ...
> Has anybody considered having the interior wall of the exhaust pipe ceramic
> coated? I've already had the rotors ceramic coated, and the company that did
> them recommended that the exhaust pipe be done as well, but it needs to be
> done while new, as it is impossible to properly clean exhaust residue from
> the inside of the pipe.

   I don't think that last statement is exactly true.  Pickling solution (main ingredient: phosphoric acid) has long been used in industry to absolutely clean carbon steels before painting.  The slight etching it does to the surface has a lot to do with the exceptional durability of factory automotive paint jobs.

   What I can't tell you is how SS321 will respond to pickling, or whether ceramic coating will adhere as well to the etched surface as paint does.

Hope this is some help.

Dale