(4) NEW VEHICLE NOISE LIMITS.-No person shall sell, offer for sale, or lease a new motor vehicle that produces a maximum sound level exceeding the following limits at a distance of 50 feet from the center of the lane of travel under test procedures established under subsection (5):(a) For motorcycles: Date of manufacture Sound level limit
From January 1, 1973,
to December 31, 1974..........86 dB A
On or after January 1, 1975..........83 dB A
(b) For any motor vehicle with a GVWR over 10,000 pounds, for any school bus, and for any multipurpose passenger vehicle, which is defined as a motor vehicle with motive power designed to carry 10 persons or less and constructed either on a truck chassis or with special features for occasional off-road operation: Date of manufacture Sound level limit
From January 1, 1973,
to December 31, 1976..........86 dB A
On or after January 1, 1977..........83 dB A