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Dear SEMA Member,

Over the years, SEMA has received many requests from members seeking information about federal and state emissions compliance requirements. If you manufacture emissions-related aftermarket parts for regulated vehicles, the parts will likely need to be tested to confirm that vehicles will still meet applicable clean air standards after the part has been installed. Emissions-related parts are regulated under our Nation's clean air laws and are primarily enforced by two government agencies: the U.S. Environmental Protection Agency (EPA) and the California Air Resources Board (CARB).

SEMA has published two brochures to assist members in understanding and complying with the laws.  The first brochure explains how the EPA and CARB regulate emissions-related aftermarket parts.  The second brochure is a comprehensive compliance handbook.

SEMA wants to give you all the tools necessary to comply with the law in a cost-effective manner. That includes explaining the law and providing an option to test your products. Emissions-related aftermarket parts include any specialty part that interacts with the vehicle's emissions system and changes the performance levels of the equipment being replaced or supplemented. They are commonly called "add-on" or "modified" parts. The product may be "emissions-related" if it is installed anywhere between the air intake and the outlet end of the catalytic converter. The term does not include ordinary replacement parts.

The information contained in this document is intended as a complete guide for any interested party to understand the emissions compliance process and to maximize the probability of a successful compliance experience. SEMA has a staff available to assist members throughout the process. Contact information is provided at the end of this document. We encourage you to contact us with any questions pertaining to the compliance process.

If you have any questions about the information provided, please contact Peter Treydte, Emissions Compliance Director at or call (909) 978-6673.


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The material posted on this site is intended as a guide to emissions certification of specialty automotive aftermarket parts. The guide attempts to simplify the detailed process for achieving emissions > compliance status with the California Air Resources Board (CARB) and the U.S. Environmental Protection Agency (EPA), which are the only authority for the programs referenced herein. The material is designed to expedite the process by which SEMA members can gain parts certification. Please note that the information contained herein is intended for reference only and that CARB/EPA regulations are subject to change. Please consult the appropriate regulations to ensure the accuracy of the information contained within this volume.


SEMA has relied upon several federal and state resources to collect the material but disclaims any responsibility for the contents. SEMA also disclaims any responsibility for any claims that might result from reliance on the contents of the posted material. These materials are not intended to provide legal advice. Compliance with the CARB and EPA regulations should be undertaken in consultation with competent counsel.