Driving at 100 + MPH
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Lexus Test Driver
Join Date: Jul 2001
Location: California
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Unless it's noise from slight flexing in the interior from hard turns, like in autocrossing, I can't think of any reason why it should be doing that. I've had my car up to 140 and held it there, the only way you know you're going that fast is the speedo... on freeways like Interstate 5 in California it's really easy to lose track of how fast you're going because there's no point of reference. The car *should* be that quiet at high speed, so I'd worry about sounds like mechanical noise on the outside of the car.
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