ยง291-22ย  Regulation of exhaust pipeand muffler.ย  It shall be unlawful for any person to drive upon the publichighways any motor scooter, as defined in section 286-2, the exhaust pipe ormuffler of which has been so changed from the factory design as to increase thevolume or audibility of the explosions within the motor thereof. [L 1941, c140, ยง2; RL 1945, ยง11718; RL 1955, ยง311-24; HRS ยง291-22; am L 1979, c 105, ยง28]