Having fun in a car like BMW’s M5 is really quite easy, given a safe enough stretch of road (preferably a track) and some time.
It can be so fun that you might want to share the joy with others, but watching from afar doesn’t really portray the situation properly.
Unless you install a high grade aftermarket exhaust system, which will provide a soundtrack worthy of action films and definitely good enough for showing off. Of the many tuners out there, Akrapovic has been know to dabble in such things on occasion so why not install their Evolution Line product on your F10 BMW M5?
Apart from lack of funding, I seriously can’t think of a good enough reason. Not after I’ve seen the video put together by the tuner. And as most exhaust systems out there, it’s not just for show, as it also brings in 10 additional Hp and 17 Nm of torque, while shedding 10 kg of the car’s total weight.