Check this thread out, BlueBimmer, it might help you some.
Also, the lumbar is only 4 way...inflate/deflate and up/down so you hit the right spot in your back where it is the most comfortable.
http://www.e90post.com/forums/showth...=seat+position
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'11 e92 335-xi m-sport - daily driver/winter beater, '06 Boxster - for fun, '07 M6- for even more fun.