I'm assuming you mean 21% or 8%?

I wasn't aware they made those percents, only 20% and 5%(limo tint)..I could be wrong though!!

BUT, check your state laws. How much are you willing to risk getting tickets, etc. If tint is illegal 8% is nearly impossible to see through so you'll attract more cops, any reason to pull you over they will.

That said, I have 35% on my car and it's barely noticeable. I'm going to go with 20% in a few weeks and get it re-done. In Michigan the driver/passenger window cannot have any tint except for 4" from the top of the window. Hoping I don't get any tickets. My brother has 5% all around on his grand prix GTP and he doesn't even drive through a local city around here because they know his car, and they give him a ticket every time.