R.I. Gen. Laws § 31-23-13
Every motor vehicle shall at all times be equipped with a muffler in good working order and in constant operation to prevent excessive or unusual noise and annoying smoke. No person shall use a muffler cutout, bypass, or similar device upon a motor vehicle on a highway. Any exhaust system shall be deemed defective if any changes, modifications, alterations, deletions, or adjustments have been made which would cause the exhaust system to generate a higher or louder sound level than would be generated by the exhaust system customarily installed by the manufacturer as original equipment. The defective exhaust system shall be replaced or repaired to restore the exhaust system to the performance specifications of the original equipment. Failure to replace or restore the exhaust system as required in this section within five (5) days shall be deemed a civil violation and violators are subject to fines enumerated in § 31-41.1-4.
R.I. Gen. Laws § 31-23-13