overtight lug nuts won't warp them, but unevenly tightened lug nuts will. if one nut is at 80lb/ft, another is at 70, another is at 50, and the 4th is at 100, then you have radically different pressures on different areas of the rotor, which when the rotor gets hot will cause it to warp. This is why anyone who puts tires on themselves should own a torque wrench. They're only $20 or so.
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