I was also thinking of putting on my spare 18's on the front that some fairly worn Hankook V12s for a test. I currently have 17" with very new (<1k mi) Star Specs on the car. Haven't used the the 18's for a while and the car didi track straight with them and no vibration before.
There is also a vibration in the front and steering wheel on most roads starting around 80 mph
On smooth asphalt it is less pronounced, but still there. Didn't notice the vibration at the track a week or so ago
I'm not against replacing some suspension parts as I do have over 77k on the original ones
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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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