[fbeezey X1 M-Sport]

I drive a 2014 BMW x1 M sport package and I want to make the car sound like an M series. I have heard that you can open the flap on the existing exhaust which would change the sound. Does anyone know how to do so? And if this is true will it cause any damage to the car in the long run.

If this is not possible what other options do I have to make the exhaust sound louder and make it sound like a real M series