No, I doubt they would find it but if they did, it would not be legal. There are actions that California can and will take against tuners that knowingly alter "emissions" for street driven vehicles without a CARB Exemption. The people that I know that tune in that state make customers sign "off road use only" disclaimers. The way the original post was worded, I wanted them to know technically it's all "illegal" in California. There are ways to cheat the system, but its best not to get caught doing it.