Not sure if they make it for a M3, but Bilstein has Electronic ridecontrol that is marketed as - "This system allows the driver to electronically select between a comfort oriented or a significantly firmer, aggressive performance damping mode with a simple push of the dash mounted button. The integrated control
unit switches the damping settings on all four shocks/struts in fractions of a
second to deliver the handling characteristics you desire."
http://www.bilsteinus.com/PSS_bro_fnl.pdf
There's a guy with a 335 on E90 Post that has this.