personally i would go with a dark tint all around because i also think it would look weird only dark in the back. i just got a fix it ticket about a week ago for it and it doesnt seem like that big a deal but idk much about laws and stuff. and today i got some notice in the mail with some more information and it mentions that instead of the $10 fix-it ticket fee i can pay $92.25 and i believe that means i can pay that amount without having to get my car inspected, meaning i can keep my tint

and as for night driving i have 20% on my front windows and darker in back, and i often just roll down the windows at night, the cool breeze feels good .

 

If you are tinting the back three windows go with 5% as it is limo dark and looks really good on black stangs. Ties the three windows together and gives it more of a one piecelook! Then later if you do the fronts go with 35% or 50% and it will still look great and actually darker than the tint chosen as the light in the back of the car is prettymuch blocked out! I am going with 5% on the sides and the back! JMO J