My gal just picked up an '07 1200 EFI with 3800 miles. At low speed or while accelerating engine is very rough. Has Screamin Eagle pipes but no air cleaner mods or anything else. Was told by the dealer remapping wasn't necessary for the change made. Bought with full tank of gas not sure of octane. Will it smooth out with more miles on engine? Am currently looking for stock pipes to replace the Screamin eagles. Thanks