§ 611. Requirements for Certified Systems.

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:

(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

(b) Motorcycles. (This subsection is reserved until exhaust system regulations are adopted for motorcycles.)

(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.)