It will be, theres no point in having this. You can get the CS pack on damn near all these model Mustangs, This may have a slight performance difference, but not enuff for a separate page.
Unless the CS pack lightens the car, which it may due to different body parts, better aero more DF etc, suspension, tyres brakes, it may slightly, but again, not enuff.
Although I think there we should have a better definition of "Enuff" as in how much should a car vary in order for it to have a separate page.