I don't know the exact thickness of the dump pipe but I tapped mine and screwed the probe "nut" (is it called a "plumb"??) straight in.
It is pretty thin and I was a bit skeptical when I did it but figured I'd just pull it back out and get a nut welded on if I had too. It has been fine for over 18 months now.
Mine has rear air-co too. Keep going the shroud will come off without taking anything else apart.
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