I don't even know if a cat will help with your raspyness you have now... I would put some sort of RES on it (normal one or a glasspack) and go from there. I'd be afraid that if you didn't like the sound of a glasspack that would be all you'd hear if you used it as a RES w/o mufflers. I had what the muffler called a "turbo tube" (fancy name they called their resonators) on my 90 GP and it toned my exhaust down a lot. It was about 18" long 5" round and it had three tubes in it to tone the exhaust down. It was not for sound really, but it gave the exhaust extra tubing to go through to calm down the muffler ping (raspy). It didn't do away with it 100%, but it helped A LOT.
