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1. I think they might be upgradable with some custom modding. But I don't have one so I'm not sure.
2. You could use ZipZap accessories(sp) with custom modding I suppose. Each RC car comes with upgradable wheels and body parts.
3. I saw them at Wally-World and I think their about 1/40 scale or so.
4. The Muscle Machines Die-cast cars are probably 2-5 dollars I'd guess.
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