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The 4.2 with a dual works well, although I think I actually prefer the 3.8. But, in a booster car, I would only use the 4.2 pro. That motor will last longer in a booster. I've killed many a motor with a booster car.
I would absolutely, positively, only recomend an internal dual cell. If you get the batts low enough in the chassis, then it wont flip unless you hit something at the right angle to make it flip.
I've made a small army of internal dual cells. I've perfected the technique.
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