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Exhaust systems, mufflers and noise control - 75 Pa. Cons. Stat. § 4523

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     § 4523.  Exhaust systems, mufflers and noise control.
        (a)  Compliance with established sound levels.--Every motor
     vehicle operated on a highway shall be constructed, equipped,
     maintained and operated so as not to exceed the sound level for
     the vehicle as prescribed in regulations promulgated by the
     department. The test procedures and instrumentation to be
     utilized shall also be established by regulation.
        (b)  Compliance with exhaust requirements.--In addition to
     any requirements established under sections 4531 (relating to
     emission control systems) and 4532 (relating to smoke control
     for diesel-powered motor vehicles), every motor vehicle shall be
     constructed, equipped, maintained and operated so as to prevent
     engine exhaust gases from penetrating and collecting in any part
     of the vehicle occupied by the driver or passengers.
        (c)  Mufflers and related equipment.--Every motor vehicle
     shall be equipped with a muffler or other effective noise
     suppressing system in good working order and in constant
     operation and no muffler or exhaust system shall be equipped
     with a cutout, bypass or similar device.
        (d)  Unauthorized modification of equipment.--No person shall
     modify the exhaust system of a motor vehicle in a manner which
     will amplify or increase the noise emitted by the motor of the
     vehicle above the maximum levels permitted under subsection (a)
     or violate the provisions of subsection (b). Headers and side
     exhausts are permitted provided the vehicle meets all the
     requirements of this section.
        (e)  Fire equipment and racing vehicles.--This section does
     not apply to fire equipment or to racing vehicles being operated
     in an organized racing or competitive event conducted under a
     permit issued by local authorities.

Last modified: November 27, 2007