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.Wash. Admin. Code § 204-10-038
Statutory Authority: RCW 46.37.005 and 46.37.320. 08-19-079, § 204-10-038, filed 9/16/08, effective 10/17/08.