Motorized bicycles shall be equipped with an exhaust system, where applicable, incorporating a muffler or other mechanical device for the purpose of reducing engine noise. Cutouts and by-passes in the exhaust are prohibited. The system shall be designed to prevent leakage and all components shall be securely attached and located so as not to interfere with the operation of the motorized bicycle. Shielding shall be provided to prevent inadvertent bodily contact with the exhaust system during normal operation.