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Message: <blockquote data-quote="E46Fanatic" data-source="post: 211573" data-attributes="member: 81">While they share the same part no's for struts, roll bars etc, I think the spring rates depends on the spec of the car if I remember right due to weight differences between different engines, transmissions, accessories etc.  It's usually chosen from a BMW coil spring table in the spare parts catalog.  Quite unique for BMW suspension systems vs. Aftermarket. Maybe our E9x guru can share some of his thoughts <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />. Also I found different specs of sports suspension for the E90. There are Sports Suspension part nos, Sports Suspension - Poor road package parts and M sports Suspension parts. Interesting...</blockquote>