ByPro,
I have 18 in rims. Stock rims. The Bridgestone were 17 in wheels and tires off a 2001 Boxster. If I would not have swapped them out I would say it is mechanical but after driving those wheels and tires I have to say it is associated with one or the other. I am currently looking to find a local 986 boxster that would be willing to try a swap and drive. That would tell me alot. Just had the boxster out again to go to the store and pretty smooth up to 50 or 55 mph. Once I get to 60 and above it starts and gets progressively worse with speed. When I get to 75 the whole car is shaking.
Not fun to drive at highway speeds where you spend a lot of time.
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2000 Boxster - Loved and sold
1999 911 Cabriolet - Also loved and sold.
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