I'm looking to replace my stock muffler on my 83 and wondering what my options are. So far, the only one I've seen is the RB. Any suggestions or links? I'll be running a complete stock exhaust ahead of it.

 

There are many available mufflers for the FB. RB just happens to be the most widely known/used.

 

I am using THIS as my muffler. I have stock manifold and gutted cats.
With silencer in, it's not too loud, and good for the street. With it out, it's loud, but you can't beat the flow of a a straight through muffler.