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Well, I know you're all sitting on pins and needles waiting for the diagnosis, and here it is: Mudflaps! Seriously, while we were on our trip (to Porsche Palooza in Eureka Springs, AR), we noticed that the bottom edge of the flap on each side was partially torn. With the wind, it was flapping. Hubby taped each side to see if it made a difference before we headed home, which was just under 200 miles away. Didn't hear the sound until about half-way (groan). When we stopped for lunch, we saw that the tape had pulled off. So, empirically, that's the cause. We're still going to run it over to our P-car mechanic when we get a chance. We also found that the tires need balancing, but that wasn't related--vibration, not noise.
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