My 78 H30 was repowered with a 2GM20F. It has a water discharge to the starboard side of the exhaust. Water "pees" out the water discharge and exhaust. I haven't gotten to the very back of the boat yet ( to chase hoses and check on the rudder linkage). I've seen several videos of the same boat with the same motor without this water discharge. Input on why there would be a separate one compared to just letting it all go through the exhaust? It does have a new H2O heater with engine heat exchanger. Wonder if that is the reason. I got to do some exploring.