Awesome replay, just what I was after cheers :)
Is there any non-ball diff options for the 18t series? Any more info on the XRay? I would drive it in and outdoors, nothing too dirty though, generally a fairly well groomed home track as well. Youtube doesnt like my videos much (chops down the quality a lot), but heres the first few lap attempts on the first build of our track if your interested
http://www.youtube.com/watch?v=sfCfql0Tixo fairly small now, plenty of room to expand though.