1) BB (Big Bore) kit is boring and swapping for larger pistons, i.e. 904cc.
2) Snorkel is a rubber (snorkel looking) apparatus that sticks out of the top of the airbox (look under your seat). It can easily be removed (or replaced) by squeezing and pulling out. It restricts airflow into the airbox. You can also swap the stock paper filter for a UNI that allows a little more air flow. No air box mod required.
3) Many swear by the "Freak" - an airbox removal kit with pod K&N filters. Personally, I want my airbox to stay right where it is and I don't see the big advantage. Each to their own, but I haven't seen a better dyno chart for what I'm looking for than my own - the most power and torque I can get in the 2000-6000 range. For those curious, my dyno at 5250 shows 60 hp and 60 ft. lbs. of torque. I don't care about a max. reading at 7500 other than making sure hp is increasing smoothly and air/fuel mixture is ok.
