I dont know why I want to, just wondering. I was thinking of treating the exposed parts outside the SS (piping and flanges), when I thought of doing the same to the inside.
Here's my thinking: When the metal on the inside heats up, it expands. This in turn deposits carbon IN the metal, not just on it. If I were to heat up the pipes, and clean the $h!+ out them with the marine clean and a bung hole brush. Repeat. Then neutralize with metal ready. And finally, coat insides and exposed outsides with POR 15 high temp exhaust paint.
IMO, this would exhaust gasses more quickly. Carbon deposits will be minimal, and even easier to maintain (repeat marine clean process every few years). SS exchangers would last almost forever (not really:-) Then again, I was $+*n'D

when pondering this.
BTW chris, I wasn't thinking of having you do it

. I did my fuel tank you know. These should be easier. If I were to acutually do it!