has anyone here retro fitted or heard of anyone fitting the active cruise control set up into their m5? or does anyone know if you could buy this as an option? been looking around and i cant seem to find much info on the subject. i already have pdc sensors in the front and i can see the picture in the cluster for it. so now im wondering what it would take to make it all work. i do know that there will be some coding involved but what hardware is need?