info on rev box for a rancher

[05 rancher]

Do thay have rev box for ranchers,any up grade parts,to get some more pep out of the 05 rancher 350 es 4x4....

[440exking]

All you can really do is get it to rev faster, not get it faster top speed. If i were u i would put stuff on it for mudding that or get a sport quad.