i have an atr pipe, im almost positive it's stainless...
i do industrial insualtion, and we have alot of crap i've found to be useful, i have the a type of the fiberglass wrap, the kind they sell in jegs, that i could use...i also have stuff that i could water/liquid/vaper proof over top the fiber glass wrap, and then over top that i have stuff that would fire proof it...it would either be black, or white, im working on getting a gray color too, just not sure if they make it...i think i might do it once i get my motor back in and see how it works out....
once it's all said and down, ill try and get some pics of it, it should come out lookin half decent, plus it'll be sealed from moisture, and fireproofed...
once all done, and i get the pics, if anyone wants any of the stuff used to do it let me know, i can get the stuff for free, just have to pay the shipping...