well all i know is at bikez.com the 2000 model drz 400e has 50 hp and the drz 400s has 40 hp if u want to check for yourself. to me that is a lot more power than the klx 250s, but i think i am going with the klx anyways. if its not to my liking powerwise i guess i will have to do some mods. but i dont really know about working on bikes so i hope i can learn from everyone here when i decide to work on it. but thanx 4 the info.