I sold one for $300 and they picked it up about year ago.It was stainless with the original pitbull muffler and I had it polished.I dont think you will have a problem selling it for around $300-$350.Good luck!
Just a side note... I just added a Magnaflow muffler to mine and could not be happier. Sound is much better. And there is no drone. I had to cut 3in off the headpipe. But, I would do it again in a heartbeat.
It is a 5x8 case, I believe 14in long.