Well congratulations! And aren't you the Travel'n Man -- perfect bike for you! To an extent can 'tune' the vibration bumps when you balance the throttle bodies, sub 4k will never go away completely and the bike will always shake a little there depending on how you load the engine, the 5k bump though will probably pretty much go away or become unnoticeable when your barely used bike is actually broken in. Stack popping (not to be confused with back-fire) is part and parcel on the 8V on over-run. So what color is your 2014 and how much did you have to part with?