A friend of mine just purchased a nice 2006 Ebtide deck boat with a Merc 5.0L MPI. The previous owner told him to start the boat for a few seconds after he pulls it out of the water to clear the exhaust manifolds. I have never done that even for a second for fear of damaging the impeller. I told him I pull the drain plugs from the exhaust manifold to drain the water. Does anyone run the boat for a second or two like the previous owner told him?