The cat is.........gulp.........$663 ! But i have no doubt you will find a willing trader. If not right away, eventually. However, does the bike have stock exhausts or tors? From what i hear a gutted cat and stock exhaust sound better than tors and stock cat and is about the same loudness which is not a lot but better than stock. And if you run the tors tune you may get a simiar increase in power like with tors and stock cat.
As for different cats, i'm quite sure they all use the same cat even the 1700. And even if there were different ones, the ABS has zero reason to have a different cat than the non ABS.