A neighbor had me help with the small amount of welding needed to adapt
a Honda generator muffler to fit his B&S powered generator. All that
was needed was to fabricate the elbow to mate the different style
flanges and to fill the 6 or 8 holes in the muffler case that I presume
were for some bracketry on a Honda generator.

I didn't hear the results, but the owner was happy with the
improvement. The generator was used for camping at shows and swap
meets where quiet makes for good neighbors.