Can you change out the cats with the test pipes without removing the X-pipe?
I'm just thinking about when we have to smog the car?
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."