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Message: <blockquote data-quote="LarryMc" data-source="post: 427382" data-attributes="member: 13895">The fins will help a lot on a non-tunnel jet to reduce cavitation. I'm not sure about a tunnel boat, though. Given that a tunnel is designed to force water into the intake and the fins are also designed for the same thing, I kind of doubt it. I've had them on my boat a few times but they usually don't last long (at least for me) on a non-tunnel boat because they lower the amount of clearance that you have on the front edge of the intake. That wouldn't be a problem on a tunnel boat, though. They will improve the steering on a jet if that matters to you. I know that the stern on flat bottom jets is bad to slide around on turns. My Lowe also slides quite a bit on turns and when I had the fins on, they helped to reduce the amount of sliding. I just got tired of replacing (and buying) them when they got beat up too bad to straighten out .Send Brian O'Leary of Outboard Jets an email at info@outboardjets.com and ask him about the fins. He can give you more information about how they will work on a tunnel boat than I ever could. He usually sends a reply within a day or so and he's very good about helping people out with questions about their boats.</blockquote>