I live in Jersey as well. I'm not sure to tell you the truth. I know we're a pretty strict state when it comes to emissions. If you are throwing a CEL that will probably be checked come time for inspections, which means you fail. If you still have one cat it's possible that you'll pass the smog test, but not sure. And if Jersey does a visual inspection I'm sure they'll be able to tell that it's an aftermarket peice, which will also end in failure.