WAC 204-10-038. Exhaust system

A motor vehicle must be equipped with a leakproof exhaust system that includes the exhaust manifold(s), headers, the piping leading from the flange of the exhaust manifold(s), the muffler(s), and the tail piping. Exhaust systems on property-carrying vehicles must: (1) Discharge the exhaust fumes to the rear of that part of the vehicle designed and normally used for carrying the driver and passengers. (2) Discharge the exhaust fumes at a location to the rear of the vehicle body or direct the exhaust fumes outward from the side of the vehicle body at a location rearward of any operable side windows. (3) Not have any part of the exhaust system pass through any area of the vehicle that is used as a passenger compartment, nor in close proximity to the fuel system without being properly shielded.