the cop likely wouldn't know the cup car intake isn't factory, but the state ref might, the airbox might not be stickered.
like 25p says if its a cat back its only illegal if its louder, exhausts aren't covered by emissions (for cat-backs) only noise, but not all state refs are aware of it so make sure you are.
Exhaust Noise and the Law California USA
engine dampeners they don't care, just anything thats part of the emissions chain