If it's for show, red tint, just because it's one more thing that can get you points with the judges.
If it's for driving, and it's in a northern climate, no tint.
If it's for driving and it's in a southern climate, swap those back side windows for tinted windows. Put a normal tint on the front side windows and rear windows. Don't put tint on the front window, that's what visors are for.
If it's for driving, and it's in a northern climate, no tint.
If it's for driving and it's in a southern climate, swap those back side windows for tinted windows. Put a normal tint on the front side windows and rear windows. Don't put tint on the front window, that's what visors are for.