At my old job we threw out a ton of piping and fittings that were cluttering up the shop, so I have a bunch of these in all different sizes. They are super strong and we used them for support couplings, high pressure piping, etc.
They would work really well for exhaust, but I cannot find a gasket for them that would be able to handle the temperature. We use to use them on steam lines with high temp ceramic type gaskets, but they are still not rated for exhaust temperatures.
My best guess would be to use a piece of solid core wire soldered together to fit inside the groove. Does anyone have any experience?