Kmot , thanks for the pics and the shop advice said that today many car guys make there mufflers from copper for scale effect .
My issues is how to keep it together , I dont know if silver solder will hold up to the temps of a gas engine and if not radio interferance will be 100% a factor from medal to medal vibration .
I can tell you that Lowes sells great light weight copper tubeing , very similir to that used in gas home appliances and or water distribution but its small , workable and not bad in weight , even the connections are light .
The issues is will the silver solder hold to high heat and if not its not worth the effort because I have read countles post on radio interfernace and its all from medal to medal vibration .