My brother has a Dodge Neon that he has done some modification to. I know he has been pulled over for his exahust making too much noise. He was also once stopped at a gas station, a Calvert County Cop pulled out a yard stick and measured how lowered his car was, then proceeded to write him a ticket for it being too low. The tint (35%) is definitely true but cops rarely enforce it around here. Neon lights underneath are illegal also. I'm sure there are tons of other ones in addition to what has been said by other guys.
-Matt