Perhaps it should cost us a while to get used to its sound, to the passage of an eight-cylinder vee, a straight six. In any case, the sound of BMW M4 exudes aggressiveness, strength, decibels that in no case had reached its predecessor – at least standard. And as usual, for those looking for something more beast, is always the possibility of using the optional extras brand, a louder exhaust system, or even to suppliers as Armytrix , which has developed a special exhaust system for BMW M4 and BMW M3 . An escape that also has a wireless device for opening and closing valves to increase or decrease the sound and pops to consumer tastes. This escape can hear, in all its splendor, in this video.