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8.1 Pre-testing of vehicle sound levels <br />Minnesota Department of Natural Resources OHV Re�ulations 2022 <br />i�1k�w ff �� rs <br />• I�a �a�r��n sF��aJI e�p�rat� a v�hi�le umless i� i� e�quipp�d �ith a muffler ha�ing a <br />s�a�k arr�st�r ap�p�ra�r��d �y th� U�dted �tat�s ��or��t �ervice. J'+,+'tinnesota I�ul� <br />�1i���Q�4� su�p�art � �. <br />• �veralf ��is�e �mi��i�r� f��orn �TV� an� �F#'r�s ma� r��t �xcee�d �� ��e�rbel�. �t a <br />�drs�a��e �f �� in�F�esb <br />•�FiJ'tihs ti�at ar� ��t c�sm��etitrc�n c�+cles, and v+r�ere rna�Ufa�tu�red in �r aft�er <br />1���6, ma� ��t ex�e��i nc�is� �ern�s�ic��us �a� �'� �d��itaels at a dis�anc�e �f �� inch�s. <br />� l�+4vffl�rs rna� r��t �� alt�r�� #� increas�e i-n�t�ar ��i�e, �ar Fna�� a�utc�Ut, h��pass, <br />�r s�milar �d��ric� �x�e�t i��s�d at r���gar,iz�� e��nt�.. <br />SAE J1287 test procedure <br />