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Hi Rick, I'd run'em, if you are worried about your investment, you bought the wrong thing anyway. On the Teamslot, I have just one, but it required quite a bit of tuning to run well. If you have some Fly cars, I'm sure you must be familiar with tuning!? Mine had a lot of slop in the axles, the gears barely meshed! If you do some tuning they run pretty well and quiet down.