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I am experiencing the same thing, just a subtle resonance around 1200 - 1400 rpm, notice it more at slow speed. It seems more noticable if I'm going just a little faster, and back down through that RPM range. A similar resonance at 72 - 74 mph on the freeway. My dealer, who is a great guy and has his own SS/RS, drove my car and says his feels the same. It's definitely in the exhaust, but so far the conclusion is that it's "normal." Anyone else? Thanks.
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