True Duals Legal in California
California laws specifically prohibit motorcycle owners from using aftermarket products that would require the removal of components and/or parts related to emissions control, unless the part is either (1) a “replacement part,” (2) a part approved for use by the ARB Executive Order, or (3) a part intended for use solely in competition. 1) “Spare parts” – spare parts are spare parts that have the same function and effect on emissions as the parts they replace. This means that if a vehicle was not originally equipped with a catalytic converter and all other emissions-related controls that have been plugged in, such as oxygen sensors (O2 sensors), are reconnected, the part is considered a spare part. If the vehicle is equipped with a catalytic converter and the installation of the part prevents the catalytic converter (e.g. the catalytic converter system) are NOT removed and all other emissions-related controls are reconnected, this is also considered a spare part. Plug-in silencers in applications where the catalytic converter is not included in the original muffler are an example of a replacement part. Complete exhausts of the system, when installed on vehicles which did not originally incorporate catalytic converters and whose design allows the reinstallation and original operation of other emission control components, shall also be considered as replacement parts. (2) The Executive Order parts are emissions-related spare parts that ARB has assessed and determined not to adversely affect emissions. An Executive Order (EO) is the document signed by an ARB official that documents the ARB`s approval for certain motorcycles. Any residual exhaust system that replaces or otherwise interferes with emission control equipment, including catalytic converters, requires the sale of an OE for use in California, unless the system is intended solely for competition. 3) For competition only – parts used exclusively in competition on pure racing cars.
These parts do not require a permit until they are “used on public roads”. The designation of a product as “Racing Only” or “Closed Course Competition” is not sufficient to be included in this classification. It must be a competition vehicle and may not be used on public roads in California at any time. You can also visit the MIC website for more information on aftermarket exhaust systems, click here. For more information on the California Air Resource Board, please click here.