WoW ! i put the factory pro shift kit with shift spring & Detent.. plus the Star, its what the denten rides on. it rounded on the edges makes for a smoother/ quicker shift. What a great pruduct... Then i did the Air box mod .. you remove the air filter cut alittle plastic out of the air box and use a little foam and hot glue to patch up the hole's ..then you put to air filters on the intake scoop boot's [they kinda look like two big dirtbike filters] &thats it WOW no put their jet kit in and your flying.....