There are a whole lot better engines then the HPI 18SS like the OS 18 CV-R and are cheaper. I am a HPI man but the HPI 18SS is not all that great! Here is a good radio for the money and you will never have to worry about a frequency conflict ever again. $144.95 and you just cannot beat 2.4GHz!!!!!!!!!!!!!!!!!!!!!!

http://www.ultimatehobbies.com/istar.asp?a=6&id=SPM20200!1002&csurl=%2Fistar%2Eas p%3Fa%3D3%26dept%3D36%26manufacturer%3DSPM%26sortb y%3D%26numperpage%3D16%26