I have an '08 and I agree with Doc. drain both the crankcase and oil tank. Put back only four quarts if you remove and drain the oil filter, otherwise about 3.5 quarts ought to do it. I have used Mobil1 V-Twin but to each his own. If you haven't removed or disabled the AIS
that will fix your backfire problems. Should be good to go. Vibration? Pretty normal, especially at idle. Enjoy! I love mine!