I found a use for header wrap once, I got full road rego on my 1982 420cc Husky Automatic Enduro bike. They come with a single skin expansion chamber and a tiny, very loud muffler; double skin pipes are much quieter, and I wanted to quiet it down so my neighbours wouldn't lynch me one dark night. So the expansion chamber got a high-tech alloy spray coating that stopped it rusting, then I wrapped it in said header wrap and then I coated that wrap in Fyberglass, that helped to stop dinging the pipe as well and added an absorption-style double the stock length muffler hoping all this lunacy would cut its cackel down, Didnt work at all, it was still just as painfully loud as before but with the added feature of smelling horrable as that Fyberglaass cooked from the engine heat. It stayed like that for a few months till I got sick of that smell, and so I cracked it all off. In the end, I just put up with the sound; it convinced me to buy a 1992 4-stroke TE 350 Husky that was way easier to live with.