Computer Controlled Human Player:

First enter the cheat for paintball then go to multiplayer & with at least 2 people. Let one person get heavily damaged: let them go into pits but don't follow in stead enter the pits at an angle so as not to be controlled by the pit computer; now shoot the other player out onto the track before there pit stop is over. Now they are under the computers control and will race the rest of the race.