Jerry Hey wrote:

Paul,  the exhaust pipe can be centered or off set toward the engine
per the attached drawing.  What do you recommend?   Jerry

I don't know. I would guess you would not be able to measure the difference.
Perhaps off set where the internal whirl wind would have a straight shot
at coming out might be slightly less back pressure and slightly more
noise. That would be off set away from the engine rather than towards
the engine as shown. I don't really know.
 
Paul Lamar
 
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