Got my black 420sel tinted....20% in the rears, and 50% in the fronts. 50's aren't legal, but it's such a huge contrast between the front and rear that it's impossible to tell. I paid about 240.00 for a tinting specialist to do it by actually removing the windows (takes longer, but creates basically zero flaws)

5% is limo tint.....DO NOT GET THIS.....ull be running over animals and people at night because it's like you're blind

20% looks like limo tint, but allows more light....still hard to see at night but u can manage

35% is a normal looking tint, but it's still pretty easy to see inside...very easy to see out

50% very light

Car looks beautiful now I'm sure yours will too good luck!