Kentucky Revised Statutes Title XVI. Motor Vehicles § 189.140.Mufflers; noise regulation

(1) Every motor vehicle with an internal-combustion, steam or air motor shall be equipped with a suitable and efficient muffler. No person while on a highway shall operate a motor vehicle with the muffler cut out or removed. No cutout shall be so arranged or connected as to permit its operation or control by the driver of any motor vehicle while in position for driving.

(2) No person shall modify the exhaust system of a motor vehicle or an off highway vehicle in a manner which will amplify or increase the noise emitted by the motor of such vehicle above that emitted by the muffler originally installed on the vehicle. The original muffler shall comply with all of the noise requirements of KRS Chapter 224 and regulations promulgated pursuant thereto. No person shall operate a motor vehicle with an exhaust system so modified.