IMO the best part about modifying the exhaust on the new superbikes is the new fuel map. When I installed the termi slipons on my bike the new ECU was worth more to me than the loud pipes.
The new fuel map is amazing compared to the stock map. The stock map is freaking garbage. It makes the bike stall all the time, and at low throttle applications it makes the bike snatchy and jerky as hell. Now with the new map I don't have to feather the hell out of the clutch to keep the bike from stalling from a stop, and I can dive way deeper in to tight hairpins and not worry about the jerky/snatchy nature of partial throttle application.