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ymmv

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  • Porsche Club
    PCA (Porsche Club of America)
  • Present cars
    96 Carrera 4S Turbo 2WD
    04 Carrera GT
  • Former cars
    94 RS America

ymmv's Achievements

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  1. Rear toe is out of balance. The eccentrics are a weakness in the rear suspension design. It's not all that surprising, but sadly Porsche has carried this idea on to the 997. Rear camber might also have changed. Either track driving or bad roads can cause the rear toe to move out and this will create that tail shimmy on a shift. Just to be complete, while it's rare, perhaps one of the rear tires is not in the same condition as the other. This tends to happen when there's a puncture and replacement late in the life of a set of tires -- the new tire will be "bigger" and have different heat and grip characteristics.
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