ive got a losi 6.5 in my b4 with all the rudebits brass gubbins +80grams up front and it still picks the front wheels up!!!! and top end is ballistic with standard rtr gearing (yes mine was a rs) any motor will be fine aslong as you have the facility in your esc to turn everything down!!
My advice get the best motor you can afford so you have the best equipment in your car and start with sedate settings in your esc, and gradually turn it up as and when you get used to it
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