For gasoline (520i, 530i, 540i). Here you can make "louder" by other methods, but this is a risk: straight pipe = increased noise, claims at the technical inspection, not to mention the difficult reversible design. But active exhaust of BMW G30 in the form of iXSOUND solves the problem without compromises: when you need it, "powerful exhaust of BMW G30" you turn on the maximum, when you don’t — you turn it down to a comfortable level.