Bruce A. Frank wrote:

Super Trapp mufflers are very loud AND restrictive and require periodic
disassembly and power wire brushing to remove carbon build-up that clogs the
slots. As Paul Yaw wrote, you'd be much better off constructing a muffler
from vented pipe through a shell filled with stainless steel wool. It works
well, is more quiet and has virtually no back pressure. I will suggest that
rather than using stainless steel "wool" that you use the type of stainless
in the form of the "pot scrubber". This is more coarse and stands up to the
pressure pulses for much longer than the "wool".

I would like to point out that a tangential muffler is much lighter
at four pounds, less the flanges. If you use a stock Mazda type
3/8 thick mild steel flange that alone weighs four pounds. 

If you use the Everett Hatch style four bolt flange the flanges 
would weigh much less of course. A muffler about
six to eight inches in diameter about eight inches long with 
a two inch down pipe about 10 inches long  made from .040 Inconel 
will weigh less than four pounds. This is the entire exhaust manifold
and muffler! It will be quieter than a 172.

PL
 
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