(a) The exhaust of every internal combustion engine used on any vessel, excluding those vessels documented by the United States Coast Guard and licensed pursuant to Code Section 27-2-8, shall be muffled or baffled and water injected, except those engines that exhaust through the lower unit or outdrive when the vessel is on plane, so as to decrease noise. Vessels competing in regattas or boat races approved under the provisions of Code Section 52-7-19 may be exempt from such provisions.

(b) The operator of any vessel, when requested to do so by any law enforcement officer authorized to enforce this title, shall submit the vessel to a noise level test.