To all you people who think this doesn't affect you: Regardless of your reason... you ride an old bike..., you think too many people ride loud bikes..., you believe the laws won't get enforced, etc..., you're not thinking this through. This encarnation may not affect you, but the next one will. Don't think they'll pass one law and stop there.
This is a classic example of how the incremental erosion of our FREEDOMS happen. They start with something common sense, that the least number of people will resist. Once that foothold is established there's no going back. They gradually add to the original (seemingly benign) law, a few lines at a time, until one day you wake up and they've added a clause that does affect you.
Wake up people! It's not a huge leap to imagine the day when helmets are mandatory (not just in Cali), engine dispalcement and horsepower are limited, or even, old bikes (polluters) are outlawed.