From the RTR? Big bore springs, aluminum steering rack, and if you have the $$ the big bore shocks too. I think when you look at the cost you will quickly realize that it is would be cheaper to sell the RTR and just buy a 10.2. However, if you are like me, you might be a bit stubborn and actually enjoy adding all these upgrades. The electronics in the RTR aren't all that great either. A nice sensored ESC with a decent motor is good too.