The tunes for standard and off road mufflers for the new R3R's are both "unrestricted" in gears 1-3, which means the secondaries are open 100%. In gears 4 and 5, there is restriction above 4600 rpm. You could open this area up if you're confident that using TuneECU wouldn't lock up the ECU. It's probably not worth doing anything until you change the exhaust.