Nice scream and loud.
It sounds the same and almost as loud as the straight pipe I had. I tried it once and the sound was great, really loud. I couldn't drive with it anymore, the neighbors and the police, etc.
The N52 is a bit loud engine. If you compare e.g. M54 with the same exhaust setup.
Flap open and 7500rpm. It sounds nice and actually better than in the video.