I would go for the 5.5 as you can always turn the power down a little, whereas the 6.5 can, on a big track in 4wd, feel a little lacking. If you turn the limiter down on the ESC, it softens up the power delivery on the 5.5 for dirt, plus you can go to a softer throttle profile too.
Alfonzo, yes, you can hook up any brushless motor to the R1Pro and the RS, the major difference is, the RS can use the Sensor harness. Yes, if you have the hotwire, you can connect the R1 to your laptop, update the firmware, have much finer adjustments to the different adjustments too.
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