Wow, thanks for the comparison. I thought it sounded really muted compared to my E90 PE and PPK, especially on start-up and then you switched to "sport" mode and yep, that's the sound.
I actually kind of wish I could do that type of adjustment as on the E90 it is pretty loud on cold start-up...neighbor's always give chit about it. ha.
Congrats and enjoy...makes me wanna go fire up the baby in the garage.