depends if you are talking 2nd cats or primary. if you want a 2nd cat delete and a res delete (Like I have)I would highly recommend it. 100% legal, and doesnt cost much at all.
just do it and be happy. Thats all I can tell you.
However, if you are thinking primary cats, I would advise against it. State depending, but most inspections make it illegal to delete your primary cats.
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