It really depends on 2 things from what I figure, the color of the car, and what look you're trying to go for. I went with a classy look for my black GS300, so I did 15% rear, and 35% front. It ends up looking very nice and both are obviously tinted. If you want the striaght thug look at 5% all the way around and add TV's everywhere along with 24" wheels.