I've rode (started on dirtbikes) off and on since I was 12 years old. Last dirtbike I owned was a modded 2000 Honda CR500R.
Sold the CBR in the background as I'm getting too old for the riding position. Mods were full titanium Akrapovic header to muffler (cat deleted). Yoshimura fender elim kit. Honda quick shifter. Light weight lithium ion battery. Tuned and all restrictions removed.
Fatboy just has Vance and Hines Eliminator 300's on it so far.