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No drill hydrofoil

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I just acquired a 21' deck boat with a 115 Mercury 4 stroke. The boat runs great but is a little slow to plane. I am thinking a hydrofoil and prop swap will cure this but have never used a no drill hydro. Does anyone have a recommendation? 

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I bought some a year ago & I promise you they work!

Installed one on my 75 Merc and it made a huge difference in my boats handling and performance.  I also stepped my prop up from 17 to 21 due to my rpms being too high (but I don't think that was a result of the hydrofoil.  it was already running higher than it should have.)

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