20% all around including windshield, or 20% windshield and 5% all other windows is the way to go.

Even with 20% tint, when the sun is shining into the car the windows look untimted.

 

lol i was just asking for it.. but i got 5% all the way around.. got pulled over twice.. one let me go.. the other gave me a ticket the little thing they use said 3% but this one i'm doing legal 35% its just to much of a headache... the car gets enough attention as is... prob do 35% all the way around and then 40 on the windshield which should make the windows look like 20% and when i get pulled over it'll show up as 35%