When you say 80% you mean 20% for tint right? 80% would be very light, as that means it's 80% visibility.
How hard is it to see out of at night when backing up and is that 20% all around?
2011 V6 - Premium
6 Speed Auto, 2.73 Rear, K&N Drop-In
Black on Black, Mustang Club of America
20% Tint, Color matched mirrors, side rockers, & rear valance, Flat black calipers