What are the laws about vehicles with modified exhaust systems?

In California, vehicles with modified exhaust systems must still follow certain laws to be considered roadworthy. California law states that modified exhaust systems must be installed in a manner that does not increase the noise level of the vehicle beyond the maximum established for similar unmuffled vehicles. Additionally, the modified exhaust system must be installed in such a way that does not increase emissions of harmful gases or particles from the vehicle. Furthermore, the exhaust system must not allow excessive smoke or noxious fumes to be emitted from the vehicle in any way. Lastly, all exhaust systems must not have any sharp edges, protrusions, or other objects that may come into contact with any other portion of the vehicle, or interfere with its normal operation. In other words, modified exhaust systems are allowed in California, but they must meet certain criteria in order to be considered legal. If an exhaust system does not comply with the requirements specified by California law, the vehicle will not be allowed on the road. It is important to certify that all modified exhaust systems meet these requirements in order to stay compliant with the law and avoid any legal repercussions.

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What are the laws about vehicles with modified exhaust systems?

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