this was my fix www.e90post.com/forums/showthread.php?t=663817
my sunroof drain was clogged causing water to build up and drain into the carpet, hope this helps.
2007 335xi, dci, JB4, debaged, Tints, Front splitters,Mtec V3 angel eyes. M-tech rear, VRSF downpipes. 19' style 95 rims, 18' 260M, 19" matte black Euro tek rims, and lots of E85, 70/30mix with 93