I test drove an S6 a while before I got my S8, it made a nice noise but the two cars are worlds apart, I'm so glad I resisted the S6 and waited for the S8
B&O is worth waiting for, I didn't understand the appeal until I heard it for myself, it's probably the one thing I wouldn't be without now. I had Bose in my D2 and always thought it was good, but B&O just blows it away
Good luck with your search
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Audi D3 S8 - 2007 - V10. B&O, Phantom Black, black and silver interior, and still completely standard with everything working as it should
Audi TT - 2015 - Ultra