the catalyst code means that the change in chemical make up of the exhaust the computer is looking for between the pre cat sensors and the post cat sensors hasnt changed enough. This is usually a cat problem, but sometimes can be a sensor problem. Dealer diagnostics are usually required to get to the exact root of the problem. The 50k laws shouldnt matter between states because it is a federal law, i'd try that route.
You could always trade in for a 5.0 like everyone else seems to be doing!
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