Square exhaust pipes on rotaries were discovered by the Russians.
     It breaks the sound up into more frequencies. I think. Maybe like
     homogenizing it :)

     Paul Lamar

Paul, Square pipes probably cause opposing wave fronts and additional
surface friction. This is another one of those items where less sound
probably means more in cowl heat. The energy, sound or heat has to
go somewhere!
Bill Jepson

 
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