I have the Model-tech Magic Extra 300 w/the Magnum XLS52, APC 12.25 X 3.75.
The plane goes together easy and the engine runs great once the baffle is removed from the muffler. Muffler is very restrictive with it in and only takes a min to remove.
It pulled vertical like a raped ape but I couldn't get the low end set to stay running in flight with that baffle in.

It should fly fine with a 46FX.