I am skeptical about the effectiveness of this device. I tried wakesurfing behind my I/O, which has the exhaust coming through the prop. Well, the exhaust fumes were horrible while wakesurfing. I don't know what it was exactly about how the air circulated and how the exhaust came out of the water but the exhaust fumes were certainly prominent. I sold the wakesurf board because I thought the fumes were too much of an issue. P.S. Don't give me any crap about wakesurfing behind an I/O. I had a safety device installed to prevent contact with the prop...I won't go into details.
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