Any of the test pipes able to clamp the original cats back up for smog testing, and then swapping back to the test pipe?
Most seem to cut the stock pipe pretty close to the cat and I'm not sure there's enough tubing on the stock piece to clamp back on.
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."