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Marc, I've got the same problem. My boxsters pretty smooth until I hit 80 or so....then it's vibration city. Really sucks. Love the car, but after spending over 20 grand on the purchase, I'm a little disapointed to say the least. Takes all the fun out of it. I've taken it to the local Porsche garage a couple times and they check this and that, but it's still the same. I've got 18 inchers on it and don't know if that could be a problem as the 98 came with 16s. Had a Saab 95 before this and it was as smooth as silk. I don't think I'll find the "high tech" equipment you guys got in the US here in Spain, so I'll just have to keep trying....till they fix it or I get fed up and sell her. And 80 mph isn't that fast here, the speed limits about 72 mph (120 kph).
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