Tuned pipes will work fine on the engine. The noise levels are reduced quite nicely, but then the propeller noise becomes more noticeable, so you'll likely need a better less noisy prop then too. But the gas engines behave more like four stroke glow engines, as they turn lower RPMs, so a 10cc tuned pipe may or may not work if you can't get it long enough for the lower RPM engine. But it won't hurt to try it out though. It may work really well even without trying to tune it up for more performance.

I was playing with a tuned pipe with this engine a while back too. I forget which pipe it was, it could be a 10cc but I think it was a 15cc pipe though. I was using it on a 26cc gas engine. It did help quiet the engine down quite a bit as compared to the little lawn mower mufflers many people use on the gas engines.