California gets a burr up their ass every once in a while and periodically starts rolling enforcements of vehicle laws - actually the only place in the US I ever saw cars getting pulled over for an all out safety check was in Huntington Beach a couple of years ago when I was there for a fraud conference.
We were sitting in the Denny's and watched a couple of motorcycle cops pulling over cars that looked modified. they had tint meters and tape measures and what I assume was a decibel meter, sniffer and OBDII scanner.
They had a regular ticket writing party going on there and everyone got one.
Let's hope that you don't get stopped by one of those checkpoints or you meet a cop that had a fight with his wife that morning.
If they are really pissed, then they'll impound your car and inventory it.
Huntington Beach is the absolute worst. They are notorious for pulling anything over. I ride Harley's and mob once in a while down there and we've been pulled over at least a handful of times. Good thing is, 60% of my buddies are LE...:usa2:
I own nothing that isn't heavily modified from motorcycles to cars...my belief is, you ride like an ahole, you get treated like an ahole.