E38 Exhaust System Upgrade

I’d been experiencing a little of the white steaming from the exhaust system the last two seasons, no overheating issues as the boat still holds 185f at cruising speed. So I’d been systematically going through the heat exchanger system and checking for blockages etc. Now I was finally onto the exhaust system and had decided to replace the old exhaust hoses.

The backflow flapper check valve, muffler, and hoses all appeared original, although a previous owner had installed a galvanized iron...