I got in a 100 mile ride in this afternoon, running down to my brother's house. Right before I left, I drilled the muffler as shown above. I never expected it to sound that good. It has a nice bass thump, thump, thump during idle, has a nice rumble through the gears, and a steady growl at highway speeds. I was very impressed with what eight 7/32" holes did to the sound of the stock muffler. The draw back (at least on mine), was a little louder and a little more muffler farting. I'm still glad I did it. It's louder, but maybe something like 30% more, so not a lot. It totally changed the acoustic properties of the muffler to make the Boulevard actually sound like a motorcycle. It took away the metallic sort of two cycle dirt bike sound (though bassier) out of it completely. Thanks for the submitting the picture.

they are all belt drive.
if yours is chain then it's custom.

The savage was rebranded around 2004.
the us 4 speed was available from 86 to 88
then came back to the us in 95 as a 5 speed.