I think a lot of ppl are over powered now a days.
and a 6.5 is just about right. in a 4x4 and 7.5 in a 2x4.
But really it all depends on the track.
if you really want to know whats best for you then you'll have both of them ready for action.
I've seen ppl run 7.5 go faster around the track then ppl running 6.5 & 5.5 .
I think you need to find the right motor for your driving style.
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