M5 or M6? #BMW | #F10 | #M5 | #F10M5 | #F12 | #M6 | #F12M6 | #mcars | #5series | #6series | #mpower | #Bimmer | #mperformance | #bmwperformance | #bmwmperformance | #motorsport | #BMWmotorsport | #performance | #performanceone | #awg | #autowest | #auto