General Motors is committed to performance parts development that allows enthusiasts to modify their vehicles and remain compliant with emissions requirements. The product descriptions for some parts listed in the Chevrolet Performance Catalog are accompanied by the “50 State” icon: Consumers are advised to familiarize themselves with the EO and its limitations and restrictions to ensure that such parts are installed and used properly. The EO number will appear on a special exemption label affixed to the part or its packaging. An EO is granted if the product has been determined not to reduce the effectiveness of required motor vehicle or off-highway motor vehicle pollution control devices or result in emissions levels that do not comply with existing state or federal standards for the same vehicle model year for which the part is approved, nor otherwise cause engines, vehicles, or equipment to be noncompliant with the vehicle emissions certification and anti-tampering laws.Įvery aftermarket part that has been exempted by CARB is assigned an EO number and is subject to installation and use restrictions. This exemption is called an Executive Order (EO) and allows the part or modification to be installed on specific emission-controlled engines, vehicles, or equipment. Manufacturers of add-on and modified emissions-related parts (aftermarket parts) that sell their product for use in California vehicles must obtain an exemption from the California Air Resources Board (CARB).
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