Good idea or bad?

Anyone know I’f this type of exhaust is a good idea for someone who plays alot in water I have a sportsman 850….I feel like with this idling the engine under water shouldn’t be a problem? And anyone know where I can get this I’m thinking it’s a attachment to a factory exhaust Attachment 27612

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Good idea or bad?-uploadfromtaptalk1447449765713.png