I would give 5 stars but the motors got very hot after 4-5 minutes of use with a 60-70 lb child in a car with two of them. I'll say it's worth the money if you're looking for speed. I will test them later with my youngest child. I was very surprised how much they increased my top speed and acceleration. My kids were driving around in an empty car and with two of them the top speed was around 7-8mph.
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