Nail'd features boost stunts which allow you to max out your boost meter for maximum speed and these are performed by doing different things such as landing on an opponent via the Monster MTX stunt, or holding a Wheelie for over 5 seconds, or riding on a wall completely sideways for a few seconds. This is pretty cool, but it quickly loses its uniqueness, as there are no other tricks or feats to accomplish other than the 15 or so that are described in the game's manual. While those are nice, I would have preferred the ability to do tricks in the air, or the ability throw fists to smash your opponents, kinda like Road Rash. http://naildbiter.com/nzdYN