I thought 16 SM 17 America. Went to 19 and never looked back. Taller gears, smooth highway riding, not a fast hole shot but I was a rider not a racer. It was similar to adding a 6th gear. In 5th you can get it to the ton up state but not hit the rev limiter. Just not enough HP for that set up.
I loved for cruising the taller gears made it so smooth to ride.