I used to have a '97 royal star tour deluxe which I purchased
second hand about six years ago.
I did the "big foot" airbox mod, dyna3000, vmax cams and springs and a vmax rear diff.
It revved so well to 8,000 rpm I didn't need 4th or 5th gears any more.
I could have saved myself some effort and I did anyway and bought myself an '04 Venture with all the power I need for this type of machine.