Q: What do I need to know about engine modifications?
A: In general, state and federal law prohibit modifications to your vehicle's emission control system. When repairing your vehicle, the emission-related parts used must be original equipment manufacturer (OEM) parts or be replacements for the OEM parts, as specified by the part manufacturer. Modifications to your emissions controls are not acceptable unless the parts used are approved/exempted by the California Air Resources Board.
The California Air Resources Board (CARB) grants exemptions in cases where the changes do not modify the performance of the emission controls in a way that causes an increase in emissions. CARB assigns the exempted parts an "executive order" (EO) number that may be used to verify acceptability. CARB provides a listing of EO exempted parts on the CARB website.
Minor changes that do not affect the connectivity with or operation of other emission controls may be acceptable, for example, the installation of universal replacement hose in place of a preformed hose.
Q: Can I change the engine in my vehicle?
A: An engine change may not be performed if it degrades the effectiveness of a vehicle's emission control system. For more information, see BAR's Engine Change Guidelines.
The following apply to any modifications or deviations from the original emission control configuration:
* You must use Original Equipment Manufacturers (OEM) specification parts for use in your specific year, make, and model of vehicle.
OR
* The part must have an Executive Order (EO) number that shows it has been exempted by the California Air Resources Board for use in your vehicle.
OR
* The equipment used must be certified by the U.S. Environmental Protection Agency (USEPA) for use in
your specific year, make, and model of vehicle.
Check out the Bureau's "Engine Change Guidelines" brochure on this Web site for additional information.
http://www.bar.ca.gov/80_BARResources/07_AutoRepair/Engine_Change_Guidelines.html