The standard BMW M5 in e60 edition is like 5-seated Formula 1 one car. It drives enourmously fast due to adapted Formula 1 V10 engine with maximal output of 507hp. Its maximum speed reaches 330km/h and its accelerations beats many Ferraris and Porsches.
However the idea of tuning is to make great things even better. This is example of exhaust modification in BMW M5, one of autoniusy favourites cars. Watch and hear how it sounds.