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I have found that most "droning" sounds coming from Porsches are caused by tire wear, tire faults or alignment. Low profile tires can start to drone long before the tread wear would warrant replacement. Start there before starting mechanical work. I just proved this to myself this week when I replaced a set of tires on a "new" to me 997. Thought is was mechanical for sure, but tires fixed it. How many miles are on your car?