Does it look like that is for sure where water is coming in? You could try jb weld at least if you epoxy it you will know for sure if that's where your leak is, I'll bet if you look hard enough you would find the parts. I believe there is a place called westside powersports that is highly...
Ok wasn't sure what engines you had, I just looked online and they looked threaded into something, hard to tell in your picture but it almost looks like a hole near the bottom of the pipe, could just be the picture though
That looks different than my challenger, mine has the pipe going through it with a clamp, I have the single engine,not sure about yours but with the amount of water that was coming in I thought that would be the area to look at
Check your donut gasket where your exhaust exits the boat, you can do this from outside the boat, there's a clamp on the pipe and the gasket folds over it to hide the clamp, just unfold it off the clamp and you'll be able to see if the rubber is dry rotted there, I'd bet that's where it's leaking.