Oregon Revised Statutes Public Health and Safety § 468A.350

(1) “Certified system” means a motor vehicle pollution control system for which a certificate of approval has been issued under ORS 468A.365 (3).

(2) “Factory-installed system” means a motor vehicle pollution control system installed by the manufacturer which meets criteria for emission of pollutants in effect under federal laws and regulations applicable on September 9, 1971, or which meets criteria adopted pursuant to ORS 468A.365 (1), whichever criteria are stricter.

(3) “Motor vehicle” includes any self-propelled vehicle used for transporting persons or commodities on public roads and highways but does not include a vehicle of special interest as that term is defined in ORS 801.605, if the vehicle is maintained as a collector's item and used for exhibitions, parades, club activities and similar uses but not used primarily for the transportation of persons or property, or a racing activity vehicle as defined in ORS 801.404.

(4) “Motor vehicle pollution control system” means equipment designed for installation on a motor vehicle for the purpose of reducing the pollutants emitted from the vehicle, or a system or engine adjustment or modification which causes a reduction of pollutants emitted from the vehicle.