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There are no factory suspension enhancements for sport XI models. That said, there are cheaper aftermarket options than coilovers (i.e. H&R sport springs for $250). And I reckon (hope?) that BMW is making a Performance suspension upgrade. Bilstein is set to come out soon with shocks for us as well. Is there light at the end of the tunnel? Also - your warranty isn't voided unless that particular non-OEM component specifically caused the claimed problem.
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