Stock Car Racing or Stock Car is a game mode in Destruction Derby and Destruction Derby 2. This is all about circuit racing - a flat out race to the finish with no points awarded for smashing other drivers. Instead points are given from the race position of the player - 1st place in the original DD gets 50 points.
In both games you can choose for a Stock Car championship, time trials or just a race practice. In the original DD it is also possible to play a duel.
In DD2 in Stock Car, you can repair your car in the pit stop as many times as you please, but remember that you have to cross the finish line 1st, so don't go to there too much.