I had a Saito 100 in the 40 size Funtana and it was a great combination so the 91 will be almost as good. Now I am not a big fan of the Funtana since mine had the wing rock problems, but if that problem did not exist, it would have been a great plane. There are some here that have resolved the problem. I would also consider a 60 size profile for this engine. I think OMP and Morris both have some.