How heavy are you?
How hard do you ride?
Canyon carving?
Track days?
I mean initially you should set up the stock suspension anyway for you. It will make a noticeable difference but depending on how much you weigh and how hard you ride, the Busa suspension typically needs help. Now on the Gen I Busas the front forks suck. Gen IIs may fare better but I have never had a chance to beat one up in the corners. It was better when cruising around IIRC.
Now on my Gen I, I went all out on suspension and brakes. Huge difference in both categories and I mean huge.