the EFI yfz's are by far the slowest YFZ out an they have been slow with developing power for them. i think FCI has a 480 kit for the EFI models an he has gotten low 60's out of it but i hear the efi models have a better suspention an ride much nicer that the old carbed bikes so i guess u trade power for comfort they are like the step children of yfz's lol