[Cain]

The MBX5R has updated suspension geometry and bigger shocks, with the shock towers to go with it, as well as steering rack.

I have an MBX5 that has some of the R parts on it, and with the steering rack and R front arms, it can turn on a dime, almost too much steering.

If you are really concerned about that though, your best bet may be to go with an RC8 since it is the new kid on the block.