[BrianG]

Ok, here's how it breaks down:

Air radio + Air ESC = You need mechanical brakes and you won't have reverse. No other mods necessary.

Air radio + Car ESC = Mod the radio so the throttle returns to center for neutral. Motor brakes and reverse are available.

Car radio + Air ESC = Need Pistix adaptor and mechanical brakes. You won't have reverse unless you use a mechanical setup like a nitro Revo for example (extra shifting servo and use another channel to switch between forward and reverse).

Car radio + Car ESC = No mods necessary for full operation.