Hey all - my 450f runs like a lightswitch, it's either on or off. I was thinking of putting a heavier flywheel on it and was wondering what kind i should get? I know yamaha and trailtech make flywheels for this application and wanted to see what u all prefer. any suggestions? I was also wondering what kind of exhaust everyone likes to run and please give details as to how the exhaust effected the powerband of the bike. thanks!