Your opinion on top 5 mods every buell needs

[Loki]

What would you say are the top 5 mods, upgrades every buell owner should do to their bike to make it preform even better?
ex. K&N Air filter

[Mesozoic]

I've got almost 40,000 miles on my XB12 and I do not have any oil issues in the airbox, therefore have never done the breather reroute. In any case, I'll throw in my top 5 based on my experience:

1. Exhaust upgrade - stock unit is too quiet, it's not about the power increase, but the sound.
2. Right side cooling scoop, particularly useful in warm climates.
3. Independent O2 sensors for front and rear cylinder with accompanying flash mods - make the bike get tremendously better fuel economy and much smoother riding long distances.
4. Rear wheel with 3 large bearings upgrade - not fun having the rear wheel seize up on you!
5. Cosmetic stuff: bar-end mirrors, integrated LED tail w/shave and LED headlamps among a few.