for more power look into parts the factory kawi teams are running. Josh creamers KFX450R is running a Fuel Customs intake. that has one of the biggest openings i have ever seen, and will deffinatly wake up yorue KFX. a good programmer is annother thing you will need to reach optimum performance. kawasaki sells one as part of there accesories, or the next best is the Dynojet PClll or PCV. a good exhast is one of the bigger differences. DMC duallies, or the Procircuit T-4 full systems used by the factory teams will help alot.

i also heard good about the Yoshimura RS-2 on a KFX450R