They had the elbow on hand and it is quite stunning to see how much ID there really is.
The other parts will be in by next Friday.
Figured as long as I was doing this, I'd do it right and replace the exhaust hose and clamps as well.
I'll save the old pieces for quick spares... if I get stuck somewhere in the future, it may take about an hour or so to swap these parts. I have to go to Home Depot to get some black iron parts to build up all the connections for the whole system. I plan to have the whole thing duplicated and ready to go.
It will be interesting to see how the boat runs when I am all done.