I would agree with tailspnr in regards to the prop and the muffler.

I thought the 12x4 was the best all around prop with the TT46pro on my SE. Make sure you have a reward CG.

Those moussecan mufflers make some good power and will help your TT46. Another option to the mousse can is to buy the muffler that comes with the Tower Hobbies 46 engine. You can get it for $15.99 and you'll probably increase your rpm's anywhere from 300-700. The Tower muffler fits perfectly on TT and OS 46 sized engines.