I think you do need the sway bars to upgrade to m sport. I'm selling m m sport just in case you decide.
http://f30.bimmerpost.com/forums/sho....php?t=1225576
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PS2+ WMI + MHD Bef+JB4, VRSF DP, CP, FMIC Race 6, AFE Intake, MP-LSD, MPPK, MPE, MP-Susp, MP-Brakes, 437M, MP-interior trim, MP-Alcantara Steering Wheels W/race display, MP-Lip, MP-Diffuser, MP-Spoiler, MP-Rocker Panel, MP-Sills, MP-Pedals, MP-Grille, MP-Mats. XDI-35 HPFP installation pending....