I FINALLY found the U-bend yesterday while working on Colleen, and am convinced that I will be getting this done. Problem with doing it is:

What do I do about keeping the O2 sensor? I am NOT interested in deleting the rear O2 sensor at all.

Did those of you who did keep the rear sensor just mount it off to the side?

What does it take to make a sensor mount in a custom pipe like that?

I remember reading someone doing this, but my searches turned up nothing. Thanks for your patience and advice, yall.