Just sharing. After inspecting and torqueing everything else, and thinking how stupid it is to do it but feeling a little desperate I looked up the tailpipe. What a way to spend a Saturday. It broke the rear O2 on the way out as well. Truck ran fine like this out of boost; boost a different story. Lack of power, stumble, and sounded like the blower had a hole in it. But I am happy because of all the other things I thought of that it turned out not to be.