RE: Noise related question
The 46 ax with an 11x5 or 11x6 prop and the stock muffler isn't really that loud. The 55AX will be underpropped in that range, and you'll have a lot of prop noise added. With the 55AX, you could go with an 11x8, but you still risk being underpropped. I'd go with the 46 ax in your situation.
Brad