Wizz, I have a magnum 46 that I love..... hope yours works as well. I have on OS carb and a magnum 52 (extra volume) muffler on mine. It just screams. I run an APC 12x4 on it (4* 40 plane) and it is perfect. Go to larger wheels or bend the gear in a bit or whatever it takes to run a 12 inch prop. The extra diameter and low pitch is great for 3D or in close flying.

Ernie