Stay WAY away from aluminum A-arms. If you hit some thing and they bend...it is all over for them. I agree with RPM or Techno arms. They are good stuff. Let see you can do the center alloy skid cage...that is a good upgrade. The sway bar kit is good stuff. Do the single steering servo upgrade. Wheelie bar, rear wing mount... The Revo just does not have the hop ups that a lot of other RCs have really.