I have the factory tint in all of the back windows it seems like 20%. I just tinted the two front windows 35% for 80 bucks with lifetime guaranty. Took the guy 20 minutes but it looked good. So it looks like a fade from rear to front. 20% would matched better with my factory tint but I think it would be too dark to see at night. My brother inlaw have 5% all around on his rx8 and looks awesome in the daytime but have to rolled his windows down to reverse at night. LOL

Btw it is illegal in most states to tint front windows. Some states allow it but I dont think anymore than 35%.