No problem on the thread jack, sometimes these deviations are enlightening. If I'm leaking some coolant it cant be much. I'll keep an eye on it and if it gets worse I'll go looking for a good used replacement. The Y pipe was pretty cruddy on the inside around the outlet from the supercharger. Mostly oily but some green too. It wiped off easily with a rag. Here are the pictures for documentary purposes.

Les

Edited to add pictures