The holes should be bent so that the aft side is in and the

outside,

forward, is bent out, Virg

Finn Lassen wrote:

I don't get it. Wouldn't the exterior air tend to pressurize the

muffler

and thus increasing back pressure?

The drawing Ed sent seems to be opposite Virg's description.

Finn

The protrusion on the forward side of the hole creats a low pressure
point and helps draw the exaust out.  The inward protrusions on the
aft side scoop the exaust outward. I NEED A DRINK! Virg

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