Your not going to hurt anything by removing the cat. There is really no point to put high flows on, unless you are concern with the smell of the exhaust without a cat, are worried about inspections/test. Or... if you are a hippie.
We remove them off everything around here, and the police don't care. It might be a federal offensive, but when the PD that would be dealing with you doesn't care, then why bother spending extra to put them on. I don't know of anybody around here that has been sited for no cats. But in states that are strict about that, I do know a few people that get hit.
One reason I don't like to run cats, is because the exhaust tone & volume are so.... SO much better with no cats.