I have the world models SuperSports 40 as well with one of my TT .46s. Don't be fooled. It will fly fast. Put a 10x6 on it! Even though it has a large draggy looking wing it will scream! But doesn't hover as well on that prop as with the 11x4's. If you want even more power go to tower and buy the replacement muffler for their .46 at $15.

http://www2.towerhobbies.com/cgi-bin...&I=LXJB16&P=ML

Its a direct bolt on and acts like a tuned pipe. Makes an already incredible engine better. But as in most cases when you add power you add noise. So its a little louder than the stock exhaust. I still use my SS40 as a warm up plane before I fly my 1/4 scales.