[aerohead]

I will have to guess.It's a faster car,designed for faster tracks,and it's lower drag body won't decelerate at closed-throttle like the short-tail.Since it's still a track car it see's nothing but transient loading,with a lot of kinetic energy that must be dissipated by the brakes since it lacks the higher drag,and the air slot may join a duct which channels the air directly at the caliper/rotor to forestall brake fade.