O.K. Guys.... I looked everywhere. It seems that female 1/8 NPT -27 exhaust bungs made from Titanium are not stocked anywhere, other than lots of 1,000 ordered from China. While M18 x 1.50 Titanium exhaust bungs for O2s are everywhere. I keep getting responses that some folks had them on their shelves years ago, but don't stock them now. You would think that there are 4 bungs setting somewhere.
Surely, someone runs EGT sensors with a Titanium exhaust.