3rd gen aftermarket exhaust?

I just bought a 91 and I wanted to put a muffler on it since these things are so quiet stock and sound really good with some pipes on them and I have found that the 3rd mufflers aren't the easiest things to find, and I was wondering if there was a company who makes a bolt on muffler? Also I've heard about doing the 4th gen chamber pipe and then using a 4th gen muffler is this true and if so is it a direct bolt on?

 

far as me knows, yeh, the 4th gen zorst system will fit gen 3 bikes, then you basically do away with the chamber under there along with that funky graphite gasket. D&D still make a slip on for the gen 4 bike too, just cruise Ebay and you will see.

I have a Vance & Hines me bought used and its as quiet as the stock one me replaced. It looks tricker though, and me likes the shape, kinda compliments the bike better than dah stocker did.