here's a nice clip from it...
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.
Unusual noise - meaning any form of altered form of a vehicles factory equipped emissions system. (exhaust)
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"If your teeth get knocked out... swallow them and get back in the fight!"
--I'd rather be tried by 12 then carried by 6--