Bill,
I just can't seem to visualise in my mind, what you are saying - a flat
plate restricting the exhaust flow, seems counter productive?
A small drawing would help!
George (down under)

George I'll do a drawing. The way to think about it is this,
think of the standard round canister with one flat slice on the primeter. Very little restriction but it forces the flow to be turbulent. The cool tube concept could still be used.
Bill Jepson

Ok George, Here's the muffler drawing I promised.
I hope all will now become clear!
Bill Jepson

 
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