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Noises are always hard to identify through a forum. How many miles on the Pilots? If the tires are starting to feather even slightly, they can really be loud regardless of surface. If you can take your car someplace that you can put it on a lift to run the motor and trans through the gears, it may help you determine if it something other than the tires. Or, if you know someone with a Boxster that would be willing to swap rear tires for a quick test ride.
You are already did what i would have done, only option would be to continue process of elimination.
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Greg
86 Coupe (stock - pretty much like Butzi designed it) - gone, but not forgotten
65 Ducati Monza 250 & 66 Monza Junior (project)
"if you are lucky enough to own a Porsche, you are lucky enough"
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