if you run anti freeze your fine. If you drain, it helps to bump it over. I have to run my CC and give it a good rev to blast the water out of the exhaust. The hoses go down along the stringers inside the bilge and then go up hill into a big IvertaFLow by Vernay Silencer. It uses the water as a baffle, and boy that thing keeps a lot of water in the exhaust hoses...