i think it says on the description "boosts up any vehicle and makes it crash" and it does exactly that!! there are two boost codes..one more powerful (harder to control) than the other. you can go as fast as mach 3.5..(thats right..MACH..speed of freakin sound!) on la sarthe before you spin out of control. usually causing your car to literally, go beyond the map. at which point you have to no other choice but to exit the race.