Laws are different in each state but the average size restrictions for window tint on the windshield (commonly known as eyebrow tint) is 6 inches from the top, so I would guess 4 inch tall letters set 1 inch down from the top of glass might be ok. I would still check your local laws first. No one here can give you a definitive answer without your location.

 

Laws are different in each state but the average size restrictions for window tint on the windshield (commonly known as eyebrow tint) is 6 inches from the top, so I would guess 4 inch tall letters set 1 inch down from the top of glass might be ok. I would still check your local laws first. No one here can give you a definitive answer without your location.

Assuming you live in Michigan (since you want the word 'Detroit') it's 4 inches, not 6:

Technically you can't have letters, just tint. I see guys with letters on the sides of the windshield as well as the top around here.

(1) A person shall not operate a motor vehicle with any of the following:

(a) A sign, poster, nontransparent material, window application, reflective film, or nonreflective film upon or in the front windshield, the side windows immediately adjacent to the driver or front passenger, or the sidewings adjacent to and forward of the driver or front passenger, except that a tinted film may be used along the top edge of the windshield and the side windows or sidewings immediately adjacent to the driver or front passenger if the material does not extend more than 4 inches from the top of the windshield, or lower than the shade band, whichever is closer to the top of the windshield.

 

^^ This..but if you're still set on doing it, I would look on ebay and find one for sale and see what sizes are listed.

 

I say 8...