It's a problem in almost all forms of racing. The more important aerodynamics becomes the more important disturbances in the air stream become. Racing has gone through several evolutions. First it was raw engine power. As sanctioning bodies tried to equalize that with cubic inch limits racers worked on making cars handle in the corners to make better time. As teams caught up with each other on handling they looked for other advantages and aerodynamics were developed. In NASCAR the restrictor plates forced the teams to seek advantages elsewhere. NASCAR is going to use restrictor plates at the All Star race at Charlotte this year. Every thing sanctioning bodies do seems to lead to unintended consequences.