Jerry Hey wrote:

Typically, once exhaust gas has exited the primaries into an
expansion chamber  such as a tangential muffler,   it is recompressed
to pass through a smaller exit pipe.   Can anyone tell me why?   What
is wrong with just leaving the muffler run out full diameter?   Jerry

Its worth a try Jerry. Might be quieter if it was four inches square.

Paul Lamar
 
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