I suppose this is the place to go into a bit more detail about the mods I've done on my bike: 2006 Kawasaki EX250. Red. Part------Explaination------------Rating-----Result Headlight: Upgraded to 80/100 Xenon-(4/5), Much better visability Horn: Installed air horn (1/5), much heavier, not much louder. 12V socket: Installed marine socket, (4/5) now I have heated gloves. Windscreen: ZG Double Bubble (3/5) Better looking, easier to see through, stronger, but expensive for such a smal upgrade. Countershaft sprocket: Went from 14T to 15, then 16T. (3/5). Better mileage, more useable 1st gear, but not as much fun. Air Intake: K&N pod Filters (2/5), Slight increase in power, but not worth rejetting it 9 or 10 times. O2 Sensor: Installed Sensor and AFR monitor. (?/5). No point unless you are rejetting, then it's worth it's weight in gold. Luggage side cases: JC Whitney cases (4/5). Having cases is excellent. Price is excellent. Quality of cases is mediocre. Front Fork Springs: Progressives (5/5) love the progressives for rough riding, though I add a LOT of preload for the track. If not riding on dirt, get something else. Rear Shock: Used Suzuki RF600 shock. (3/5) Huge improvement over stock, but I wish it was easier to adjust the preload. Front Brake: Vesra Pads (4/5) Huge improvement, but probably should have spent the money for braided lines first. Rear Turn Signals: Integrated into empty pod light sockets (2/5). Had to ditch the old ones for the side cases. Visibility is worse, but with 55w signals it's still pretty good, and looks cleaner. Front Tire: Pirelli MT75. Amazing tire. (5/5) Lasts long, only $65. Rear tire, Street/Unpaved: Pirelli Sport Demon. (5/5) Best 16" tire that fits. Rear tire, track: Pirelli MT75 (5/5) Smaller, lighter, great grip, doesn't last as long. That's all I can remember doing since I got it last year, though there might be some more minor stuff.