Is it possible to make exhaust pipes from carbon and have them last under the extreme heat cycles?

Would they eventually break down from the exhaust/gas?

What would be the best process to do something like this? I'm thinking custom shaped foam core "pipe" then wrap with carbon and dissolve after.

Has this ever been done on a diy basis or at all for that matter?

If you are thinking about the headers and all you have to find some very special and expensive resin,
and set your mind on failure.
To my knowledge this has not been done, due to the fact that titanium etc is better suited for this.

http://motoform.blogspot.se

To my knowledge, nobody makes headers out of CF. It may be technically possible, yet not realistic. In high HP operations with high rpms, steel headers can glow red hot without much trouble. The headers are usually steel, titanium or some other alloy. Further down the exhaust pipe, carbon could be used I suppose.

cheers

maximum EGT's would be around 900-925 deg c in the cylinder

The very, very end of the tailpipe ? Maybe, but as everyone has noted, CF doesn't handle the kinds of temperatures you find higher in the exhaust system. Headers glow red very easily.

Steve

Red bull exhaust pipes are made from a resin, no CF resin only.

If you stand by merit alone, there's no reason why a carbon tip wouldn't work. The tips don't get above 150C, so it's safe for the resin and fabric.