I still say stick to the KISS theory (Keep It Simple Stupid). Why have all the extra moving components to wear and tear when you don't need to. Also if you use a decent ESC then ESC braking will not be an issue. If it can haul up my 13lbs Monster truck it can sure as heck pull up a 1/8th touring car. Also I don't see the benefit of using a two speed in a light weight car like an Inferno GT. Decent brushless motor will do fine without it.