cobrakiwi, a frequent poster on this site, cut out my original 22" muffler sections and installed (welded in) these 24" sections from,
Classic Chambered Exhaust Inc. - Products
We used the Classic Chambered 3" i.d. muffler to replace my original 2.5" i.d. muffler. The sound difference was a big WOW.
All of my original exhaust parts; primary headers, collectors and end turn-downs/brackets, were re-used. The finished side-pipe did require re-coating, but the final cost was far less expensive than replacing my entire exhaust system.