I took 45 lbs or so off the thing. Remove the snorkel to the airbox, bolt a kn air filter right to the carb, add a good pipe, and rejet accordingly, and go on a diet

. Cost: < $100. There are more ways to get more HP & torque, like junking the stock carb and adding one of lancer's, bore out, regrind the cam, port and pollish... but I only ripped off the weight, + air, pipe, rejet. See the "savage Mods" in the tech section...
Keep in mind it'll still get whipped on the highway, but around town, it is quick as hell.
What I took off: fender, seat, turn signals, battery box & toolkit, 1 mirror, stock bars (made new one out of a pipe) left side control housing.