Jerry Hey wrote:

I built one of these a couple of years ago which I really liked but was
told it would cost me 15 to 20 hp so finally I abandoned the idea.
But this muffler could not be beat when it comes to fitting inside  a
cowl.  And it looked great--single big pipe coming out of the side cowl.

The simple tangential is the best muffler we will ever find in terms of
foot print and weight.   I wonder if it really would cost so much HP?
If you all have the time I  would like to hear the opinions of  Bill
Jepson and Lynn Hanover  and, of course,  Paul.         Thanks,  Jerry

Add a fish tail to that and you got it Jerry. A tuned version is
also possible.

Unless we test it on a dyno we won't really know. I would be surprised
if it was any worse than the muffler Tracy is now going 217 MPH with.

Paul Lamar
 
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