Since the 2003-2010 X3 shares many of it's parts with the E9x 3 series... you might want to also check in this forum for information you might be looking for.
http://forums.bimmerforums.com/forum/forumdisplay.php?189-2006-2012-(E90-E91-E92-E93)
Let me get this straight... You are swapping out parts designed by hundreds of engineers that get paid thousands of dollars for something you bought at Pep Boys because your buddy who doesn't have a job told you it was 'better'?!?
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