Just as with any other critical part of your boat’s engine, the exhaust system needs proper attention to ensure safe and smooth operation. Not doing so can lead to severe engine problems, the chance of being exposed to noxious fumes and yes, even sinking. We usually take the exhaust system for granted and expect there is little if anything that can go wrong. That’s the first mistake. While you should call in the experts if you suspect there is a problem brewing, some clues will help you head off the sticker shock of a major engine overhaul.