You live in Cali and you don't know the "golden rule"? "What they don't know won't hurt them."
Don't even tell them until you get busted, then take it to a ma and pa smog shop. Screw Cali, they tax you out the ass and expect to have a stock econo crap box and then pay $300 to register it. As for me, I'm catless pumping out 100 octane fumes. The car is registered elsewhere mind you. That's another route. Oregon P.O. box. :P