Another update:
For anyone reading this, especially those doing searches later on, don't be a dumbass like me and just disconnect O2 sensor and go around the block. I should have known better... the hot exhaust started trying to melt nearby fan wiring, etc. Lucky for me it didn't burn through anything, but it tried.
I would do the test in your driveway and only VERY briefly, or find some way to heat shield your underhood area in front of the open exhaust hole, then go for a drive.
Tony, it would be great if you could add this warning to your cat test for Zetec owners, just so they learn from my mistake. The upper O2 sensor hole points directly at some wire harnesses.
And for another update, I think I'm going to bite the bullet and buy a new cat for $261 from discountconverter.com so I don't have a huge possibly power robbing void in my exhaust system. Mostly I just don't want the engine to get buzzier than it already is!
Thanks again!!!
