The tuning world has comples ways, some of which are pretty difficult to explain to civilians. Let's take the creation from the adjacent video, for example. We are talking about a VW Golf VI GTI that has received its fair share of aftermarket goodies, with one of them being more special than others: and XBM exhaust.

As we were saying, this is not a mainstream product: while it might seem just another tuning bit, it is actualy a mix between extra hp and top sensations, changing the feeling off... [...]

Source: autoevolution