An exhaust shop should be able to take out the secondary cats to just before the resonators and replace it with straight pipes and an X-pipe for around $200. They wanted to cut after the stock X-pipe because the pipes are not round before the stock X-pipe. You'll have no check engine like, more power and more sound.
The shop I went to could even add flanges to make it removeable but it would cost more.
Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."