Guys here I took another short vid of a couple of small revs (500-4000 RPM) inside the cabin. (H-pipe)

BMW x5 4.8is H-pipe install revv's - YouTube

*note I am recording of Iphone so quality is not great but you can get a sense of this beast... I didnt wanna rev pass 4k in park but it sounds even better past 4,000 RPM at approx 5000 RPM it even has an added effect