are u talking about these motors in each individual cars themselves or swapped?
err whats the color of the 2.6KIT one? i have a yellowgreenish motor from a kit..
it feels like a 2.6 at least
but the yellowNos motor is still slow
i used to put the ZZ motors in my Bit...but i broke the heatsink plastic holder on the cassis (right down the middle, fixable with some super glue and a clamp). plus after i got the 3.0 and 3.8 the NOS is still a pathetic excuse. oh well i'll save the ZZ motors for my soon coming ZZ (mostly for modding fun).
Bits with the 3.0 are in my opinion about the best you can do for a non-drag, or they roll really easy.
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