Take it to your Porsche dealer for the balancing and alignment check up. I had a bad experience with this problem. I went to STS since I needed tires on a Saturday he sold me Kuhmos' What a disaster that turned out to be. Once I got on the highway the car was shaking like it was coming apart. I bring it back for adjustment and again the same problem. I went to my dealer and I asked to take a look at the problem. The culprit was that STS used the wrong weights and installed them in the wrong location. Last time ever I took my car for alignment to anyone other than Porsche.
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