Why not try and unload it here ? No way GC would give you a fair price anyway.
They would have to give you a price low enough so that they could make money on reselling it.
Post it here and lets see some pics.
If its has the Jerry mods, then its worth less to others, and more to those who read this board. F**K GC, JMHO
PS saw this pretty nice twin on CL NYC with the factory JBLs I think.