I think the brushed motors have more top end but the brushless has fractionally more accelaration however a brushed motor specialist spend hours balancing and re winding to lower the tolerances and other than more top end the brushed pretty much matched brushless. Dont forget that the brushed could be overgeared wheras a brushless cant, but brushless drinks less and needs vertually no work. Anyway my vintage handles a 5.5 with ease so see no reason why not only if you have sufficient spares.
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