Hi there
There is an X-Brace upgrade kit and also an X11 Steering upgrade kit. If you go on
www.teamxtreme.co.uk and go to X11 upgrades, they are listed there. There are other things you can change like the body and wings, spur gear etc. The wishbones can even be changed but there are bushes that need to be purchased to fit the X10.
I hope this helps
