Harry Guin down by the Chickamauga Battlefield probably has what you need. Go through Fort O until you get to the light @ the N. end of the park, make a L, he's on the L a couple of miles up the road. He can be moody, so 'yes, sir' and 'no, sir's may be in order if you're looking to make a good impression, but he's always been good to me. You'd be amazed at what he can find in that building!
You might also try Alvin Vaughn who has the stuff on hwy 41 N of Dalton. (N. Dalton/Rocky Face exit, go E. L. at Hwy 41 4-5 mi. on R.) Good chance of finding it there, and maybe a little cheaper, eh? Nice guy, been to some meetings.
You may need to be flexible on the exhaust; not too many junk cars with usable exhausts, you know. Maybe someone in the club has an extra around. Anyone?
Good luck!