Only when the engine is running? That seems odd as that area is
usually below the water line. The Y pipe does bolt on there and could
leak water. But I would expect a leak there to leak all the time.
Could it be running down the Y pipe form a higher point and you just
didn't see it? Or do you mean it is leaking there while running on the
trailer?

Knucklebuster wrote:
Bravo One Experts: I have water leaking into my bilge when my engine
is running. It's coming from the lower part of the transom plate where
the exhaust lines meet and go out to the discharge ports (as best I can
tell). Any idea what it is? Thanks.