44T Rear Sprocket - Just do it.
This should come standard on the bike.
Much better gearing all around, especially on the highway.
While it's not perfect - 6th gear should, IMHO, be an overdrive or they should have added a 7th - it's nearly so.
Best mod I've made so far.
2016 Kawasaki Versys 650
2003 HD FLHPI (Police Road King)
1982 Yamaha XJ650
Practice doesn't make perfect, it makes permanent.