I ordered the Eibach springs from the Tirerack and the lowering links from loweringlinks.net. My local mechanic did the install yesterday and I went to the dealer for the alignment today. I am very happy with the outcome. The ride is very close to my stock M-Sport setup.

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Current BMWs
2013 Carbon Black X5 50i M-Sport PP
2010 Alpine White 135ia M-Sport
2010 R1200GS Adventure 30th Anniversary Edition

Past BMWs
2010 Carbon Black M5
2007 Graphite K1200GT
2008 335ia
2005 545i
2004 R1150R
2003.5 M3 Cabrio
2000 540ia
1997 M3 sedan
1997 540ia