This one incorporates Brian Traube's idea of making the 32 inch long tuned 
length tubes from welded flat sheet rather than 180 degree tube bends 
welded together.

The tubes have no lower sides as those are provided by the six inch
can wall. Saves a bit of weight. No slip joint in this one.

It also uses Jeff Spitzer's idea of a side exit pipe. Again this is a 
tractor airplane side cowl exhaust.

Paul Lamar
 
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