How will CARB find out what type od cat you have? Are repair shops required to turn you in?
If I drive to Oregon or Nevada and get a new exhaust do I have to take it off when the nazi dealership reports me to the Gestapo?
They can catch it on a visual inspection - the ‘authorized’ units are stamped to indicate such.
And yes, they can force you to remove it and fit an ‘authorized’ one, purchased at a dealership.
And yes, as I understand it, repair shops are now required to turn you in or face hefty fines themselves.
Oh, I forgot to mention - as of last year, all service facilities in the state of CA are required to check and ‘adjust’ your tire pressure on your car if they so much as touch it. Guess who gets stuck with the bill for this ‘service’.
A discussion as to why this is a terrible idea is here:
In states with echeck....it is easy to enforce.