Everything you ever wanted to know about PA transportation laws Good reading. Exhaust has to be no more than 76 - 78 dBA at less than 35 MPH, 82 - 84 dBA at greater than 35 MPH. Measured at a distance of 50 feet from the vehicle. (Chapter 157.11)
"No additional lamp, reflective device, or other motor vehicle equipment shall be installed that impairs the effectiveness of lighting equipment required by this chapter." (Chapter 153.4 (a)(3))
