02 was a fair bike ;i had one from new.Prefered 03 ,04 in handling department ,03 needed alot of mods to get it to go hard though? there is plenty of mods you can do to 01 to 04 engines to suit your needs in the power department?Team green use to have porting maps as well as other things for these models but could be deleted by now.Eric gorr books are another good source.