It actually could be a tire.
I had a vibration that only happened over 80 mph. I had the tires rebalanced and it was still there
I put new tires on and no problem since
If you can, try a different set of wheels and tires and see if you still have the problem
When they balance a tire, it does not spin at highway speeds, much slower
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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