ermm it's illegal to do 20% in the front. the lower the percentage is, the darker the tint is. so 20% means only 20% of the sunlight is allowed to pass the tint. something like that. it's fairly legal to go 35% in the front...and 20's all around in the back. just as long as your FRONT are 20 you wont get pulled over unless it's a hard diick coming your way. =P
... cant bash anymore than wat the rest did so i give you useful info. =P