Oklahoma Code § 47-12-402

Title 47. Motor Vehicles: Mufflers or other noise-suppressing systems -
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Prevention of excessive or unusual noise.
A.  Every vehicle shall be equipped, maintained, and operated so
as to prevent excessive or unusual noise.  Every motor vehicle shall
at all times be equipped with a muffler or other effective noise-
suppressing system in good working order and in constant operation,
and no person shall use a muffler cut-out, bypass or similar device.
No person shall modify the exhaust system of a motor vehicle in any
manner which will amplify or increase the noise or sound emitted
louder than that emitted by the muffler originally installed on the
vehicle.
B.  The engine and power mechanism of every motor vehicle shall
be so equipped and adjusted as to prevent the escape of excessive
fumes or smoke, or both.

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