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From CHP website
"Excessively noisy exhaust systems and mufflers (27150, 27151 VC). Many aftermarket exhaust systems and parts are illegal. Look for parts that meet California law. If it doesn't say it meets the law, it probably doesn't.
Exhaust systems which meet smog requirements but are still too loud. Exhaust equipment that states it is, "Legal in all 50 states," refers to smog, not noise.
Note: New law (27150.2 VC) does not require law enforcement to use sound level meters to test for excessive noise. Citation is based on officer's judgment. Cited violators may have testing done at smog referee stations or may be directed by the court to have testing done. Vehicles in violation must be brought into compliance. A fine may also be imposed.
Illegal engine modifications. Most are illegal due to smog (27156 VC). See Air Resources Board web site for more info and list of parts that are legal. "
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Rich Belloff
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