It's the runflats. I installed coilovers before replacing the runflats and god you want to talk about a jarring ride. I swaped out the runflats and now the ride is actually more enjoyable. On a side note choose your next tire carefully if you decide to replace the RF's. The stock suspension is a little on the soft side to compensate for the RF's so if you replace them with a soft tire you'll might not like the results.
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