Personally I would be wary of a used Cat. It's just one of those things I don't feel comfortable buying second hand. I would hate to see you spend $75 on a used at and fail emissions (if it is required in FL). I recommend contacting Dave at SMSP.
Oh I noticed on your thread about midpiping. Mine didn't fit nicely withotu removing the heatsheild, but you can buy jsut midpiping. Ractive sells it, at elast that's where i got mine mandrel bent 2.25" seems to do the trick jst fine.