There is no canister that will give the boost of a tuned pipe.

We sell a canister that is patterned from a KS for 26-30 cc engines, I've run it on the 20 and it gives a slight increase in top end and is very quiet. There a couple of problems with it though, the first is the header, it's made for the Zenoah 26cc and DLE30 exaust port but this is relatively easy to overcome and get it bolted up. The biggest issue is its physical size, there is almost no 1.20 size plane that it will fit inside of and any boost it provides is eaten up by the added weight.


http://www.valleyviewrc.com/Canister%20mufflers.htm