I recently purchased an 06 Blue Five Hundred and i love it. There is no factory tint on the windows and was looking into getting it to preserve my leather interior. I have the tan interior and was wondering what % would b a good look for it? I live in MI and supposively we are only allowed a 4" strip on the front windows, but im going to do the windows anyway(just want to find a median between the law and getting it done-35% - 40% i think but have never tinted a light interior car) Any suggestions?