Stiffer springs and subframe bushings first.
Lot's of info in this forum. A few end users who drive at the track have used a larger rear roll bar and then returned to the oe rear bar due to the reduction in rear grip with a larger rear roll bar.
2007 E90 335i, TiAg, 6AT, ZPP, ZSP, ZCW, 6FL, HD
Quaife lsd, ETS fmic, GIAC s/w, Dinan intake/exhaust/oc, KW/M3 susp, Apex Arc 8, Mich PSS
Last edited by cvc 22349a; 02-01-2013 at 02:12 AM.