1. (a) Passenger Cars and Light Trucks. Systems and parts for motor vehicles (other than motorcycles and motor-driven cycles) of less than 6,000 lb (2,722 kg) gross vehicle weight rating shall comply on and after the following dates:

   Year Model

   Operative Date

   1973 and newer

   January 1, 1977

   1970 and newer

   July 1, 1977

   1968 and newer

   January 1, 1978

   1967 and older

   January 1, 1979

2. (b) Motorcycles. (This subsection is reserved until exhaust system regulations are adopted for motorcycles.)
3. (c) Heavy Trucks. (This subsection is reserved until exhaust system regulations are adopted for trucks with a gross vehicle weight rating of (6,000 lb [2,722 kg] or more.)

Persons engaged in a business that involves the selling of motor vehicle exhaust systems or parts shall sell, offer for sale, or install only certified systems or parts on the following year model vehicles after the specified operative dates: