During the mission 'High Stakes, Low Rider', keep the competition closely behind you until the pier finish line. Once the race is over the other cars appear behind you. With another car or by just walking, push Ceasar's red car up the pier and over the edge of the sidewalk into your nearby safe house garage to the left. What's the point of all this? Not only is it a pimp red car, it's also bullet proof, which helps alot this early in the game.