Good luck. I put a .18 on my GT before I traded it and that thing was wickid fast. It would pull a wheelie at 30 or so with no problem... and go much faster. It did screw with the trans a bit though. Had to rebuild it a LOT. I could probably do it in my sleep now. But I am happy with my buggy. (But would rather have a MT now... I'm one confused S.O.B.)