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I'm not sure about Cali emissions but mine will pass Maryland emissions.
Not True. If you are passing, you are doing it illegally. It may pass a sniffer test, but not a visual test. The EPA has rules against modifying the exhaust in such a way as to remove a catalytic converter. In any state when you remove it, you are responsible as is the shop that installed it, and any one that inspects it. The EPA states:

"EPA rules prohibit altering an exhaust system in any way that defeats the emissions components of a vehicle. The Clean Air Act was amended in 1990 to expand this tampering prohibition "to include private individuals and the prohibition against the manufacture, installation, sale or offering for sale of any part or component used on any motor vehicle or motor vehicle engine where a principal effect is to bypass, defeat or render inoperative any emission control device or element of design of any emission control system."

This statement reflects the EPA's position that any pipe used to replace the section of the exhaust where the catalytic converter should be is considered illegal under the revised Clean Air Act. Therefore, any work done in this area of the exhaust system must include proper catalytic converter reinstallation. It also holds responsible the owner of the vehicle and the technician who completes the illegal alteration, not just the facility where the work is done.

According to Arvon L. Mitcham, of the EPA's National Vehicle and Fuel Emissions Laboratory in Ann Arbor, Michigan, "The consequences are serious and the penalties are enormous. If anyone has any questions as to the guidelines and regulations on catalytic converter replacement, they should contact the nearest EPA office." The EPA's EnviroSense website at also contains complete information on the subject"

Now, with that being said, I have in fact removed my secondary cats. I did it, however, knowing the law and its consequences.

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