Everything that EXCAP232 said and maybe take a 12x4 prop with you as well. Some 46's wont quite spool up the APC 12.25x3.75....mine wouldnt. Especially if your running a stock muffler.

Now if you wanna develop better power and throttle response....and I mean alot better of both.....invest $25.00 and an hours time in a mousse can pipe. Crisp throttle response is one of the biggest keys to successful hovering.