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I have 20% all around and it works just great; trust me 20% tint on a mustang looks pretty dark since the windows are pretty small. You can kinda see inside during the day, but i never get pulled over for too dark of tint and i can actually drive at night without much trouble.
Heres 20% all the way around (it looks a tad bit lighter in person) anything below 20% is overkill and is pretty dangerous for night driving IMO...
35% is the limit here. I kept it legal, because even if you've never been pulled over for it in the past, your only one bored cop away from getting pulled over in the future.
35% is the limit in NC as well, but I've never seen it enforced, I've only seen tint become an issue when you get pulled for something else, like loud exhaust, and then it's usually only an issue if it's 5% or darker (around my part of the state anyways)