I should have been more specific. He's asking about tuning with it. Put it together how I mentioned and when you're done tuning you can easily put the OEM O2 back in place w/o a lot of headache. Then it's easy to swap back and forth as needed.
I leave mine in and have 600+ miles of hard track time on it now w/ no failure or issues, but I don't expect it to last forever either.
Later
"If A equals success, then the formula is: A = X + Y + Z, X is work. Y is play. Z is keep your mouth shut." - Albert Einstein
When was the last time you *really* did something with your Z to call yourself a Z enthusiast?