Maryland Code, Transportation § 22-606

(a) A person may not sell, offer for sale, distribute, or lease in this State any motor vehicle manufactured after July 1, 1974, if the vehicle has a sound level potential that exceeds the maximum sound level limits established under § 22-605 of this subtitle for that type of new motor vehicle.

(b) The Administration may not register or issue a certificate of title for any motor vehicle manufactured after July 1, 1974, unless, when the vehicle is first sold for purposes other than resale, it complies with the noise level limits established under § 22-605 of this subtitle for new motor vehicles.