Mufflers.....
.... if they are the two part cast iron ball type they are available in the USA as repro for the farm equipment...steam show small engine collectors market..... the Chorehorse was just a convenient adaptation of a farm type civvy generator for that period.
I have pictures somewhere of the civvy equivalent.... need to dig them up...
Bob C
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Bob Carriere....B.T.B
C15a Cab 11
Hammond, Ontario
Canada
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