[Kahuna]

One of those fins does require drilling 4 holes in the cavitation plate. I was a little skeptical at first, but a friend of mine put one on his 23, and I was extremely impressed with the difference it made. That is what convinced me to put on on my boat. If you are trying to obtain a lower planing speed for comfort in a sea condition as well as to conserve on fuel, it is the right modification. I think mine was like $40 at west marine or something like that. It was teh least expensive, 1-piece fin I could find, and over the course of 1 season (in the northeast, short season) it more than paid for itself.