A quick question about High Performance Cars

My neighbours' son has a suped-up Beamer and when he launches off, the engine makes a banging crackling sound, it sounds like it's back firing. This is without affecting it's performance, the car doesn't judder or pause. I've noticed other suped-up cars where the engin makes the same noise as the car accelerates. Why is this?


from AVForums https://ift.tt/2XOWqP8

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