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The Pennsylvania Code website reflects the Pennsylvania Code changes effective through 54 Pa.B. 2336 (April 27, 2024).

67 Pa. Code § 175.105. Exhaust systems.

§ 175.105. Exhaust systems.

 (a)  Condition of exhaust system. All components of the exhaust system shall be in safe operating condition as described in §  175.110 (relating to inspection procedure).

 (b)  Exhaust system requirements. A vehicle specified under this subchapter shall be constructed, equipped, maintained and operated to prevent engine exhaust gases from penetrating and collecting in any part of the vehicle occupied by the driver or a passenger, in addition to the requirements of this title for emission control systems and smoke control for a diesel-powered vehicle.

   (1)  A vehicle specified under this subchapter shall be equipped with a muffler or other effective noise-suppressing system in good working order and in constant operation. A muffler or exhaust system may not be equipped with a cutout, bypass or similar device, and a muffler may not show evidence of external repair.

   (2)  The exhaust system of a vehicle may not be modified in a manner which will amplify or increase noise emitted by the motor of a vehicle above the maximum level permitted by Chapter 157 (relating to established sound levels).

   (3)  Headers and side exhaust are permitted if the vehicle meets the requirements of this section.

   (4)  An exposed exhaust system shall be equipped with an adequate heat shield or protective system.

   (5)  An exhaust system shall extend and discharge completely to the outside edge of the vehicle body, including a truck bed, or as originally designed, except for the following:

     (i)   Gasoline powered buses, including school buses. The exhaust system of a bus powered by a gasoline engine shall discharge to the atmosphere at or within 6 inches forward of the rearmost part of the bus.

     (ii)   Buses, including school buses, powered by fuels other than gasoline. The exhaust system of a bus using fuels other than gasoline shall discharge to the atmosphere either at or within 15 inches forward of the rearmost part of the vehicle; or to the rear of all doors or windows designed to be opened, except windows designed to be opened solely as emergency exits.

 (c)  Exemption. A firefighting vehicle is exempt from this section.


   The provisions of this §  175.105 amended under the Vehicle Code, 75 Pa.C.S. § §  4103, 4301, 4501, 4521 and 6103.


   The provisions of this §  175.105 adopted October 29, 1982, effective February 1, 1983, 12 Pa.B. 3862; corrected November 12, 1982, effective February 1, 1983, 12 Pa.B. 3947; readopted December 2, 1988, effective December 3, 1988, 18 Pa.B. 5362; amended November 13, 1998, effective May 13, 1999, 28 Pa.B. 5670. The effective date of the following provision is postponed indefinitely: subsection (b)(5)(i)—(iii), 29 Pa.B. 2460 and 2577; the Department has determined the effective date for §  175.105(b)(5)(ii) and (iii) as August 1, 2001, 30 Pa.B. 3794; amended October 25, 2013, effective October 26, 2013, 43 Pa.B. 6349. Immediately preceding text appears at serial pages (250376) and (267921).

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