Good idea!,
Make sure you get the right gearing too, Anouther thing that will be important is the amount of Volts you kick through the car too. If you put to much through it the amount of punch and kick you get will hammer the gearbox interanls!
One last thing, If you go with the brushed set up make sure youre Brushed Speed Controller has a Lipo cut off point so it doesnt go 'Dead' flat as it will damage youre Lipo (If you choose to use Lipo of course). Stay with somthing safe voltage wise, 7.4v will be fine, None of that 11 odd volts you normally use, i doubt you could even use anything more than 7.4 anyways without blowing up the darn thing.
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