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86B.521 MOTORBOAT NOISE CONTROL.
    Subdivision 1. Exhaust muffling system required. A motor may not be used on a motorboat
unless it is equipped with an efficient muffler, underwater exhaust, or other device that adequately
muffles or suppresses the sound of the exhaust of the motor so as to prevent excessive or unusual
noise. A motor may not be equipped with an altered muffler, muffler cutout, muffler bypass, or
any other device designed or installed so that it can be used to continually or intermittently
bypass any muffler or muffler system installed in the motorboat or to reduce or eliminate the
effectiveness of such a muffler or muffler system.
    Subd. 2. Sale of motor that exceeds noise limits prohibited. A person may not sell or offer
for sale a marine engine or motorboat that would exceed the noise limits contained in section
86B.321, subdivision 2, under a test procedure approved by the commissioner if the motor is
maintained according to the manufacturer's specifications.
    Subd. 3. Modification of engine to exceed noise limits prohibited. (a) A person may
not modify a marine engine or motorboat in a manner that will amplify or increase the noise
emitted by the marine engine or motorboat above the noise limits contained in section 86B.321,
subdivision 2
, under a test procedure approved by the commissioner.
(b) A person may not operate a motorboat with an engine modified to increase noise above
the noise limits.
    Subd. 4. Sale of parts that cause excessive noise prohibited. (a) A person may not sell
or offer for sale replacement or additional parts for a marine engine or motorboat which when
installed in the marine engine or motorboat will amplify or increase the noise emitted by the
marine engine or motorboat above the noise limits contained in section 86B.321, subdivision 2,
under a test procedure approved by the commissioner.
(b) A person may not operate a motorboat incorporating parts prohibited to be sold under
paragraph (a).
    Subd. 5. Applicability. The provisions of this section do not apply to motorboats operating
under a permit issued under section 86B.121 or a United States Coast Guard marine event permit
in a regatta, or race, while on trial runs, or while on official trials for speed records during the time
and in the designated area authorized by the permit.
    Subd. 6. Rulemaking exemption. The test procedures under subdivisions 2, 3, and 4
shall be established by written order by the commissioner and published in the State Register.
The establishment of test procedures is exempt from the rulemaking provisions of chapter 14
and section 14.386 does not apply.
History: 1990 c 391 art 9 s 30; 2004 c 221 s 26; 2004 c 255 s 25,26