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This should answer a few of your questions. The XMODS run on 27MHz and each of the 6 current cars run on a different frequency in the 27MHz band. Replacement crystals are available so 12 XMODS can be run at the same time. The top speed in stock form is anywhere from 11 mph to 15 mph depending on the surface you're running on. With RadioShack mods, these cars should do 20 mph easily.
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