theres a guy on the wildhobbies forum who stuck a .21 in a funfactor, and it wheelied all day - at the expensive of non modded diff cups, with the mod i expect driveshafts will be next to break as mine are quite well twisted (45 degrees one of them is at...) from a .18 cvr.

i am working on the truck conversion for for my rally the spring, i hope it doesnt wheelie... ah but then i have a secret weapon to stop it happening!