2.5% on the back:
im thinking of getting my fronts done to 20%, right now theyre not tinted at all.
2.5% is great on the back, cuz at night i dont have to change my mirror so that the lights on the car behind me dont blind me, haha. but yea, its dark at night. but if you can back up using your mirrors (like i can do) or open your door and look back, then youll be fine. to me its honestly easier to back up using my mirrors then turning around and looking out my back window. but anyway, it is dark as hell at night, haha.