hey everyone i am looking for a new exhaust for my m5 e39 now i have magnaflow on it and i like to go with better quality. i have serched on eisenmann, cns, remus and tubi. do any one of you guys experience any of these brands on the your m5s? i'm trying to achieve nice quality deep sound with noticable exaust in the cabin and outside but sociable exaust, meaning friendly to the public and neighbors.