First off.. Any vehicle you have.. the strip on the front windshield.. and the two rear and back window can be as dark as you want.. the two front have to be 32%

But seriously nobody follows that lol.. I have 20% all the way around

If you get pulled over just be easy with the cop and tell him you bought the car like that lol.. and 9 times out of 10 they will give you a warning

Worked for me so far : ]