I had the Horton, took it off and put the Sportsmans STOL kit.
I asked the owner of Stene Aviation (who sells the kit) if I should leave the fences on, or remove them, his adviace was to remove them , althought I have seen some Cessnas with The fences and the Sportsman, I removed them.
By the way Im very happy I did this mod, its a totally different plane and performance is very noticeable .