I have an 08 M5... yes it does sound better than the F10 M5. But that's just my opinion. My brother has a F10 m5. It burbles all the time, but does it sound ricey? Heck no, why is it all of a sudden when an exhaust afterfires and burbles a bit it's ricey.. I don't get it.
Wait till they get an exhaust on that car.
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