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no they are not but I bet you could make it
they kinda suck out of the box but for modding they are ok they have hard wired motors and non interchangeable gears
they are not that fast to start mabie a 2.6 at most but I think the simplicity of the pcb makes it able to handel more batteries I think I saw one that was covered in batteries on gere
I was wondering has anyone tried the X-trech cars
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