In summary all cars and other motor vehicles must be equipped with a muffler, and any exhaust modifications must not be designed to increase the exhaust noise above 95 dbA.
You’re now going into a whole different subject yes noise will be an issue, but emissions will pass as long as your cats are in this is in California. The point Armando so everybody knows is in CA you can modify your exhaust as long as cats are in, but aftermarket mufflers are the best option to keep the noise level down so you won’t get a citation for the noise.