Originally Posted by zipperfoot

I would suggest building your kit, driving the buggy, and then make adjustments depending on the track(s) you will race at and your driving style. Just because the avid hexes, big bores, or steering rack are popular upgrades, does not mean they are needed to be competitive.

A 6.5 in a 2wd buggy is a handful. If you have to ask, and unless you are experienced running 2wd mod, i would suggest no more than a 10.5.