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What I can contribute is that they were very stiff. It could be that mine had a poor installation, Herold believes that was the case, but I still found them very stiff and I had a very reputable shop install them.
I can't wait to hear more about the HD version, my hope is that they slot nicely right in between stock and M3.
Thank you for starting this thread!
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2016 Alpine White M3 (gone)
2019 Alfa Romeo Guilia (Totaled)
2020 Car-less 😁 (no more)
2020 M340
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