When I was contemplating purchasing the sport exhaust for my Q70 I searched for a startup video for the 5.6L. I could not find one. I ended up purchasing it so here is a video of what the 5.6L sounds like with the OEM sport exhaust. Overall I am pleased with the sound. When I first got the car I was underwhelmed with the factory exhaust. It didn't sound as good as my '09 M45. The sport exhaust made it sound much better.
https://youtu.be/sjSfMBbzdfo