As far as a muffler goes, a "chambered" tube in 4" or 5" would be cool if there exist such an animal. I know 2.5-3" chambered tubes are good at knocking the edge off of gas motors without changing the overall character or tone of the pipes. An example would be mid year Big Block Vette's with side exhaust.
1949 Studebaker 2R16A 1961 Chevrolet Impala 1968 Chevrolet Corvette Roadster 1971 C10
