Greg, I used to live a San Jose, then moved up here by Yosemite a couple years ago. I got my muffler section from a muffler shop in Hayward on A street. Sorry I can't remember the name of shop but remember its on the same street as Vic Hubbard speed warehouse but on the other side (WEST) of the freeway. The muffler section is a like a large auger with a tube down the center, all metal so nothing to burn out. Check out the yellow pages on the web for the phone #.
Good luck!
Lee
leroy@sierratel.net