I did my fronts 20%. As much as I liked it and how it really helped cooling it off in the summer sun. It was a ***** to see at night, and trying to turn into traffic. Especially at an odd 45* angle trying to look over the shoulder. Had a few close calls. Tore that **** back off. The 5% on the other 5 windows darkens it down pretty good so that's what I'm rolling with.