secondary cats

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    Delete 2nd Cats & Pass Inspection?

    Hello, I own a 2003 3.8l V6 Mustang Convertible (5spd manual), all stock. Next week, I am going to be building a custom dual exhaust for it (either divorced or H-pipe; can't decide). While I was looking underneath to make measurements, I saw the second set of cats (long ones with the flat...