Evolution Industries has a 30 tooth compensator with chain for around 3 bills ..
4th gear at 70 changes from approx. 3620 rpm to 4500 rpm
5th gear at 70 changes from approx. 3042 rpm to 3750 rpm
6th gear at 70 changes from approx. 2570 rpm to 3250 rpm
This is the least expensive way to do it , is much less expensive than changing the final drive pulleys which may also require a belt change ..
If you have cruise on your bike , the kit may disable it , some tuners will fix that issue ..
So Many Highways So Little Time