1. (a) Passenger Cars. 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 later

   January 1, 1977

   1970, 1971, and 1972

   July 1, 1977

   1968 and 1969

   January 1, 1978

   1967 and earlier

   January 1, 1979

2. (b) Motorcycles. (This subsection is reserved until exhaust system regulations are established for motorcycles.)
3. (c) Trucks. (This subsection is reserved until exhaust system regulations are established for trucks.)

This article shall apply to the certification of replacement exhaust systems and parts offered for sale or installed on the following motor vehicles: