Don't do it! at least not on the front two windows or windshield. As far as I know, you can paint the rest of your windows straight black if you wanted. If the front two windows have tint on them, you'll get in trouble, although you're supposed to have an actual traffic violation for them to pull you over for it. Actually, it only has to be suspicion of a traffic violation...they can pull you over and say "oh i thought you were speeding" or just "you were speeding, but i'm going to let you go and give you a tint ticket instead." People that weren't even speeding generally won't argue because they don't want the speeding ticket. I've had a buddy get a ticket for the stock OEM tint on a Cadillac. The officer couldn't see a line where the tint met the window or anything. He said "well its just a good tint job. Here's your ticket"
Enjoy Los Angeles. WHen're you coming down here?