'm a big fan of Arrow; our other two Ducatis proudly sport Arrow exhausts. They sound great, they're not priced stupidly, and the quality is there.
I was very disappointed to learn that Arrow did not make a 1299 exhaust. Now that they are....
- the 2-1 and WSBK-type pipe flow really makes sense. 2-1-2 just doesn't seem to be optimal, given that the WSBK team is obsessed with exhaust pipe length.
- as much as I love Arrow, the cans they're using just do not match the bike at all. The new front-exit Termignonis that I got may have been overpriced, but they are absolutely beautiful and match the bike perfectly.