We saw no difference other than we replaced a bent skeg and so the boat was a little easier to steer and keep on a straight line especially at lower speeds. It did not impact speed at all.
The new skeg guard should be filled with the sealant/epoxy thats included before the final installation. I drilled a small hole in the bottom of mine to let any air or excess epoxy out while pressing it on. I had no lose of performance.
