Slant Six Exhaust Mannyfold

I measured the OD of the tail pipe section remaining, went close to the welded on flange of the pipe as the remaining tip of the tail pipe was likely a bit out of round from the rescue operation.
1.980 OD on one tail pipe section
1.850 OD on the other tail pipe section
.130 difference,, but hold on,
when I stuck my finger into the tail pipe and felt the ID of the cast iron manifold, for the tail pipe with the larger OD the ID of the remaining tail pipe felt flush with the ID of the iron manifold.
When I did the same with the manifold that has the smaller OD tail pipe section, it felt like there was a step, where the ID of the cast iron manifold was larger than the
ID of the tail pipe.

I had heard of the urban legend of the larger iron manifold exit ID on Super Six cars, but have never seen it confirmed, maybe what Chrysler had done was attach a larger diameter tail pipe to the super six vehicles. Don't know, just speculating.