if you dont want to add stuff on the motor, lighten up the bike
remove:
headlights
plastics
choose between the seat or the footpegs because you dont need both really (if you are hardcore you wont need either)
silencers
shocks (replace with cut down broom handles),
handlebars (can also be replaced with 1/3 of a broom handle)
gas cap (just dont fill her up past 1/4 of a tank)
airbox
air filter (that shit just restricts flow and will add 11hp if removed)
remove all bar work from the frame that doesnt look useful then drill the frame (speed holes)
brakes (thats what your feet are for and you dont have stupid pegs getting in the way now)
random bolts
grab bar
cut the clutch lever down to 1/2
better keep the grips because handlebar streamers will add 12.3hp and without the grips you cant insert the streamers anywhere except into your butt, now that MIGHT make you feel like youre going faster but in actual fact it doesnt add any powers, it just makes you look fancy as hell.
shave all the hair from your body (like i mean ALL of it), cut your nails, do a poop before you ride, wear something spandex preferably with your butt exposed for the streamer mod.
then ride like a bandit.