seanb,
It'll fly fine with the .46. I've seen people stick a .60 in it and flew like a jet. The Tiger 2 comes as either a kit or a ARF, and in .40 and .60 sizes. I'm assuming you want to build the kit? If you already have the .46 engine, then I would get the .40 size Tiger, if not, I would recommend the larger .60 size plane. The extra size will make it easier to see and will fly better in the wind.
Let us know what you decide.

Jesse