Take the bad hose off the starboard side, set a light to shine down the 45 degree angle pipe before it runs under the floor. Go see if you can see a decent amount of light through the transom outlet. If no, then there are probably baffle in there forming a muffler of some sorts. As for the floor part, I ended up cutting out my floor again to allow access to both mufflers after I was stupid and did not allow for that the first time doing my restoration. I dropped my boat off at the winter storage today and will not be seeing it again until April next year but I will gladly help in any way I can.

As for the going insane comment and being stumped. We had every boat mechanic in the area and even Vince at SkiDim stumped and grasping at straws on mine. As soon as I looked at the port transom outlet I knew something wasn't right. As soon as I cut out the floor and removed the port muffler, my overheat issue was eliminated. There are ways to test various theories. My testing prior to that had me running the boat with 5 gallon buckets behind the risers to catch water and both filled up almost evenly. With the whole system together with the bad muffler there the disparity between the two on a volume level was more noticeable but not alarming. I was amazed at how just a small amount of increased back pressure on one side of the exhaust sent so much water to the other side because that offered a path of least resistance.