I did 10% in the front and went over factory tint in the back with I think 15%, which made it measure to about 5%. There are tint calculators on Google.
Looks super super dark, but here is a pic with it very bright outside. This is the most you can ever see through. Usually you can't even see anyone inside the vehicle.
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2020 Army Green TRD Pro 4Runner | Instagram: @TRDHULK
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