I have an '03 Sportsman 500 HO. What are some of the bolt ons or for that matter ANY improvements I can get for better performance such as acceleration, torque, etc? Exhaust? Carbeuration? A jet engine? Any ideas from experience? Thanks,

 

Get a clutch kit first, then maybe an exhaust. Then a K&N power jet kit. Lighter aluminum wheels and radial tires help too.
You could also buy a complete kit from Aaen or Hot seat.