hi there the x10 can be upgraded to x11 i would defo get the front gearbox top and brace also the spur gear and the new shocks will be worth buying as for info speak to xtreme them selfs find the phone number here on there site
www.teamxtreme.co.uk as for brushless there is sevrel ways of fitting it in theres pics on here and try the
www.the-pred.co.uk cheers hope this helps ALSO THESE CARS ARE VERY STRONG THERE IS A CERTAIN DRIVER I NO WHO PROPER GAVE IT ABUSE AT WORKSOP SEIRES