Yes they are the world famous oval CCC made by Simon Cope. They were donated to Fran from Simon, then passed on to me in Oz. They have been fitted to 3 XTX's & still are going strong.
I got my own link pipes made with different sizes from the header to the cans, this technique allows for better exhaust gas expansion which produces more HP, it also allowed me to mold the link pipe to the bike better.
I repacked them last year.
http://www.xt660.com/showthread.php?t=8360