I have an 07 colly. I am planning on gutting the cat this weekend. Besides the CEL being on, will there be any mechanical issues I need to be worried about? I just recieved the loaner pcm from pcmforless today so mine wont get back to me in time for the weekend. I plan on letting Kelly know to disable the 02 sensor at the manifold. I need to know pretty soon so help me out. Thanks ya'll.