I also have the Beluga AXLEBACK with everything else stock.
I love the sound, it's pretty good for a daily and never annoying or drony. I also tried my friends Nismo H pipe and mid pipe with it and it was just a little bit deeper but felt like it actually made more power. Here's 2 videos of the sound:
https://www.youtube.com/watch?v=ZPHt1l66_eU
https://www.youtube.com/watch?v=JtSgsJNIJ8o