Feel free to add your own pictures of mufflers& pipes here too.
These ones I have included are clickable thumbnails of a Tranzac and a Generic "can" style muffler.
4-1 pipes, outlet id:46.5mm and od:53.9mm

Generic and Tranzac mufflers side by side (both are inlet size: 55.0mm

Generic can baffle

Tranzac baffle

Generic can outlet diameter 50.1mm

Tranzac outlet diameter 31.1mm

Tranzac baffle inlet reducer

Tranzac baffle reducer

Tranzac baffle diameter

Tranzac rotten baffle

This Generic can is bigger but is also thinner in the outside wall thickness and the alloy discolours much faster (much harder to keep clean)
The Generic can has a really nice note and the Tranzac is much quieter (you hear more actual engine noise than exhaust noise)
Have not had dyno testing done but my engine (GS750 with wiseco 850bb kit) definitely feels more responsive with the Tranzac than with the Generic.
Caby jetting did not need changing (only mixture screw) which was pretty surprising as the tranzac is much smaller and would have more back pressure.
Because my bike is now 34 years young my main concern is that by running the exhaust with too big a muffler the engine could suffer damage such as dropped valves and/or seats or cause other engine damage.
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