Mufflers

Vessel operators may not hear sound signals or voices if the engine is not adequately muffled.

• It is strongly recommended that all vessel engines have an effective muffling system. Excessive noise can prevent a vessel operator from hearing sound signals and voices.
• The use of dry stack headers or pipes extending directly from the engine of a motorboat that does not have any type of muffler is prohibited except for motorboats competing in an authorized marine event.