Well, here in wyoming the darkest YOU CAN GO is 10 to 12 % with some leeway in there and the cops have better things to do than give someone a Ticket for window tint. My buddie is a Cop so I get the Scoop on what is legal. Also in this wonderfull Inspection Free state, they dont test for smog or anything like that, which otherwise I would have Tickets out the wazoo from "mods" made that deal with emissions. shhhhhh dont tell. Other wise Im fine with going darker over top of the the bronze tint already on there. and going lighter on the front 2 windows.