[Isaac Zachary]

One thing to keep in mind, after looking at the differences between the latest NASCAR rules and the previous generation, is that modding cars to make use of aerodynamic can affect cars that are close by. The last NASCAR cars were curved on one side and flat on the other, creating an airfoil effect. Basically, since the cars turn in one direction, and having the body shaped in a certain way helped the car turn always to the left. But that also was giving other cars an aerodynamic advantage since a car that would try to pass another car would have it's aerodynamic flows affected not giving it the same effect. So NASCAR recently eliminated that rule in favor of symmetrically shaped cars.