R.I. Gen. Laws § 46-22-8: Muffling devices.

The exhaust of every internal combustion engine used on any motorboat shall be effectively muffled by equipment so constructed and used as to muffle the noise of the exhaust in a reasonable manner. Outboard motors shall be equipped with underwater exhausts of standard manufacture as furnished by marine supply dealers. The use of cutouts is prohibited, except for motorboats competing in a regatta or boat race approved as provided in § 46-22-13, and for such motorboats while on trial-runs approved as provided in § 46-22-13(b), or during a period not to exceed forty-eight (48) hours immediately preceding the regatta or race and for the motorboats, while competing in official trials for speed records, during a period not to exceed forty-eight (48) hours immediately following the regatta or race.