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well you get 2 motors, one for a booster car and one for single speed
imo, i think they are the best motors for the money....
they are very reliable, i have a perfection 3.8 that is still going strong after over 7 months of abuse
the 4.2 is bit faster than the 3.8
the 4.2 pro is excellent in a 2 speed car unboosted, and boosted its maybe a little too fast
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