Here is a picture of a tangential muffler. The stock Mazda exhaust flange weighs
as much as the whole rest of the muffler. Four bolt flanges would be the way to
go. The down pipe on this design is a wee bit too small IMHO.

Converted to side exhaust with perhaps two exit pipes or one larger exit
pipe this would be the most compact and lightest system likely.

Historically the tangential muffler was designed by Doctor Porsche (I think)
for use on the original VW Beetle. Millions have been installed of course.

Paul Lamar
 
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