That is a great deal for a engine.

A while back I was setting up a FOX 45 engine to use in a new plane I was building. I wanted to try out a EZ carb I had and make sure the engine was running OK.
I got a little over 12,600 RPMs running a Master Airscrew 11x6 prop and the stock muffler. i used Omega 5% nitro glow fuel in it.
The engine is still pretty new actually, so it still needs some running in.

[youtube]http://www.youtube.com/watch?v=JDU6p9u3CqQ[/youtube]