I know this is alot, but basically you can't run a cut off exhaust. You must have an exhaust system. You can't have a loud exhaust or you get fined if it's too loud. I found a section about replacement parts that you might wanna towards the bottom of my reply. Hope this helps.
316.272Statutes & Constitution :View Statutes : Online Sunshine Exhaust systems, prevention of noise.--
(1) Every motor vehicle shall at all times be equipped with an exhaust system in good working order and in constant operation, including muffler, manifold pipe, and tailpiping to prevent excessive or unusual noise. In no event shall an exhaust system allow noise at a level which exceeds a maximum decibel level to be established by regulation of the Department of Environmental Protection as provided in s. 403.061
316.293Statutes & Constitution :View Statutes : Online Sunshine Motor vehicle noise.--
2) OPERATING NOISE LIMITS.--No person shall operate or be permitted to operate a vehicle at any time or under any condition of roadway grade, load, acceleration, or deceleration in such a manner as to generate a sound level in excess of the following limit for the category of motor vehicle and applicable speed limit at a distance of 50 feet from the center of the lane of travel under measurement procedures established under subsection (3).
(5) NOISE ABATEMENT EQUIPMENT MODIFICATIONS.--
(a) No person shall modify the exhaust system of a motor vehicle or any other noise-abatement device of a motor vehicle operated or to be operated upon the highways of this state in such a manner that the noise emitted by the motor vehicle is above that emitted by the vehicle as originally manufactured.
(b) No person shall operate a motor vehicle upon the highways of the state with an exhaust system or noise-abatement device so modified.
REPLACEMENT EQUIPMENT.--
(a) No person shall sell or offer for sale for use as a part of the equipment of a motor vehicle any exhaust muffler, intake muffler, or other noise abatement device which, when installed, will permit the vehicle to be operated in a manner that the emitted sound level of the vehicle is increased above that emitted by the vehicle as originally manufactured and determined by the test procedures for new motor vehicle sound levels established under this section.
(b) The manufacturer, distributor, or importer, or designated agent thereof, shall file a written certificate with the department that his or her products sold within this state comply with the requirements of this section for their intended applications.
(9) OPERATING VEHICLE NOISE MEASUREMENTS.--The department shall establish, with the cooperation of the Department of Highway Safety and Motor Vehicles, measurement procedures for determining compliance of operating vehicles with the noise limits of s. 316.293(2). The department shall advise the Department of Highway Safety and Motor Vehicles on technical aspects of motor vehicle noise enforcement regulations, assist in the training of enforcement officers, and administer a sound-level meter loan program for local enforcement agencies.
(10) ENACTMENT OF LOCAL ORDINANCES LIMITED.--The provisions of this section shall be applicable and uniform throughout this state and in all political subdivisions and municipalities therein, and no local authority shall enact or enforce any ordinance on a matter covered by this section unless expressly authorized. However, this subsection shall not prevent any local authority from enacting an ordinance when such enactment is necessary to vest jurisdiction of violation of this section in the local court.
