From this website ( http://www.leg.state.fl.us/Statutes/...316/ch0316.htm ) it looks like you do need cats.
"316.2935 Air pollution control equipment; tampering prohibited; penalty.--
(1)(a) It is unlawful for any person or motor vehicle dealer as defined in s. 320.27 to offer or display for retail sale or lease, sell, lease, or transfer title to, a motor vehicle in Florida that has been tampered with in violation of this section, as determined pursuant to subsection (7). Tampering is defined as the dismantling, removal, or rendering ineffective of any air pollution control device or system which has been installed on a motor vehicle by the vehicle manufacturer except to replace such device or system with a device or system equivalent in design and function to the part that was originally installed on the motor vehicle."
Also, with looking to get a better sound, keep this in mind too:
"316.272 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(13) in cooperation with the Department of Highway Safety and Motor Vehicles. No person shall use a muffler cutout, bypass or similar device upon a vehicle on a highway.
(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."
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Go Slow or Go Fast. I really don't care. Just GO! 
Year & Model:
2005 GT 5 Spd
Dyno Numbers:
Zero. Dynosaurs are extinct.
Quarter Mile Time:
It's 25% of the time it takes me to go a full mile.
Mods:
Installed:
SLP LoudMouths
Steeda Complete C.A.I. Kit
Motive 4.10 Gears
SCT X-Cal2 Tune (By American Muscle)
Sequential Taillights
Next:
Hurst Short Throw Shift Kit
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