Yeah mine is a lot louder than yours, but I think it has quite a lot to do with the piping like you said between your setup and mine. I do not have any flappers anymore, still have cat of course, and it is loud but yours is a little more toned down and clear (which I like) and I most likely have more drone than you I would assume because of that.
I cannot stand drone on my perf cars, reason I do not have borla ever on them. I run the Corsa Extreme setup currently w/o headers (yet) and its damn loud on WOT but causing zero drone, love that about Corsa and I also think investing in a quality CB makes world of difference when it comes to drone.
I have heard the B&B sound clips, I do love that sound as well. I've never driven or been in a C5 to be honest, but I hear nothing but good things about that gen from those who have.