Cut/grind the weld off?
If I cut midway through the bead or a bit lower I'll have to cut below the hex part on the O2 sensor and then can't remove the sensor (easily).
And the threads will probably be mangled and unusable...except that's the same threads as a spark plug so I can use a spark plug thread chaser to clean those up. That's probably the best option.
I could add another bung somewhere maybe. That sounds difficult unless I just have an exhaust shop do it. They might not even weld into the catalytic converter though?
Edited by grossgary, 20 December 2012 - 09:45 PM.