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Os .21 makes a direct fit motor for the revo and is plenty of power. You go to big in either the t maxx or revo the 1/10 scale parts can't handle the power and you end up fixing it more than playing with it. The os .21 is about 30% more power than a traxxas 3.3. My buddy put one in his and it will smoke my 3.3 in any application but isn't too much that you can't control it. Os is my next investment in my revo but that's just my opinion.
I would prob go with the picco .26 because it is cheaper and more motor for the money. I'm kinda torn myself been thinking of dropping in one or the other myself for about a week. I love my 3.3 don't get me wrong but it's getting old so I think it's time for more motor.