Nothing wrong with a 6.5 in a 4wd, i've been running one for the past few weeks indoors and it's running superbly with my nosram 2007 esc. I'm running the sintered rotor version for abit more 'kick' and feel.
Ive tried a 5.5 before and it is very quick, but i find for a consistant 5 minutes a 6.5 will do the job.
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