To be honest a 4.5 motor is a bit to quick for a buggy. The most powerful motor I would use would be a 5.5.
The sensor plug is for a sensor lead. Sensored motors give you a bit more control, it tend to be smoother.
Esc wise to run a 4.5 you'll have to get a top end speed control. What you budget?
I use speed passions myself l, but the orca, Tekin, and viper range are all good.
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