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Paid :-)
As for the hole to drill for the bung. You want it to be big enough that the O2 sensor passes through without hitting, but not so big that the hole is visible when the bung is placed over the hole.
I plan on placing the bung where i want on the pipe and marking the entire circumference with a sharpie, as well as a locating mark. Mark the center of the threaded hole
Best practice for drilling the hole is to use a center punch to put a divit where you want the drill point. That way the drill won't wonder when trying to get started.
After the bungs are welded on, it is a good idea to run a tap through the threads all the way into the pipe. That way you know there will be no hangups.
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