It's Allen's CFS-2 L-4, model derived from the stock FS9 Cub and a CFS-2 flight model.
It probably flies pretty well in FS9 but it would be simple to substitute the stock FS9 flight model for the wheel version. For the float version one might adapt the FS9 flight model from Bill Lyons' Cub. Or just stick with the CFS-2 flight files.
There is even a paint kit! (The paint kit bits are in the texture folder.) And a quick Google for images of L-4 Grasshopper turns up a plethora of potential paint jobs, wartime and post-war.
I would like to have a go myself, but I'm in the middle of a project with David that I don't have time to work on, and It's been a couple months since Shessi released his updated PBY-5A and I haven't done more than think about converting the all old AlphaSims textures to fit it.
That little Grasshopper cries out for more paint jobs and I hope someone who's less pressed for time will be inspired. Gaucho? Huub? Anyone else???