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I have used the doelfin and currently we just put a stingray fin ($48)from West Marine on the new Zuke 140 on an 18SF. The planning speed dropped nicely and the fin does lift the stern up on take-off. There is no noticeable digging-in at turns and the extra side to side wing length vs. a more narrow one should only improve it's function. The narrow plates work great just different.
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That priced model looks to be the drill holes to mount model. No concernes about doing that to an under warrenty motor. Mines an old 150 so I don't care. What that Suzuki weigh? I think my Johnsons about 375. Were probably close in performance except for 1 big factor; fuel economy. I get about 2mpg max.