Hey guys, Im looking to be putting together a sig four star .40 soon. This will be my first build, now im new to the hobbie and dont understand all of the engine specs, I do know sizees for certain planes but dont know the differance between two engines that are the same size that end with differant letters. Allso the four star directions call for a .30, or a .40 engine, now can you install a bigger engine on this plane like a .46 or so?