As for the 1255 kit in a Bandit, first of all, it would be a 1277 with the Bandits stroke. However, a 1246 kit is a bore in for the Bandit. A lot cheaper to do for only 31 less cc's.
As for a bandit pipe, I can't comment on what is now commercially available, but John who works on our order desk has a bandit and several years ago, Borla the car pipe maker was going to do bike pipes under the Borla name ( they already do private label bike pipes).
John loaned them his Bandit to build the pipe. He got a free pipe out of it, then Borla decided not to do their own pipes. This pipe on Johns Bandit, the only Borla Bandit pipe in the world is sooooo nice. Maybe when they found out what it cost to do the kind of quality they do for bikes, that probably figured it wasn't worth it.
Jay