Legal limit where you live is 50? Woahh. It's 35 here in TN, but I went with 20 anyway. Who really enforces tint regulation?Yes also. Percentage depends on your local laws and the color of you car.
Dark, dark tint looks great on black cars. On my white 330xi, I went with 50 front (legal limit) and 35 rear. Looks very good. Had it been black, I'd have gone 50 front / 20 rear.
Oh, they don't even do emissions checks here, so the only time a cop would see it is when you're pulled over or cruisin along, and they barely bother with it. I actually have been pulled over for it in a different car, but the cops mainly use it as a reason to pull people over and check for serious offenses. I commited/possesed nothing illegal so they let me go.Legal limit in Utah is 50 but that's only for the front. You can do whatever you want in the back.
The state enforces it. When you go in for your state emissions and inspection, they have a light tool or something to test your tint. If it doesn't test out at or above the legal limit, they'll fail you.