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If your really that worried just get a modular x pipe. They allow you to swap between the cats and offroad legs without having to remove the whole pipe.
LA has far more problems to worry about than emissions!!!! I drove thru there before Katrina and the air was horrible, along with other problem areas (no offense to those who live there) but that state needed a great deal of work b4 the hurricane. I'd go out on a limb and say you're fine with the o/r pipe