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When I purchased my Bilstein B8's, I believe they could be used in conjunction with any lowering springs. I went with H&R Sport Springs and haven't had any issues, great stance and some added performance as well. The suspension is very snug and has little give, but it is still comfortable enough on the open road.
As for the Xi, not sure...
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2014 335i M Sport - Mineral Grey/Coral Red, Nav., Premium, HK, MPE, 8AT. Mods: Macht Schnell Spacers (12mm-front, 15mm-rear) with 403M's, Bilstein B8 Struts/H&R Sport Spring combo, M-Performance black kidney grilles, IND Distribution color-matched reflector inserts and key hole cover.
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