It does not sound as good as NA, but still not that bad for FI. Sounds better than RS6, but of course the M5 has to be heard live with production exhaust.
IMO best sounding V10s:
1. Lexus LFA
2. Porsche Carrera GT
3. BMW M5 (E60)
What is sure, no M5 (F10) or RS6 V10 will sound like this M5 (E60) OneandOnly Sound.
[u2b]<object width="480" height="385"><param name="movie" value="http://www.youtube.com/v/8Gg6mh6j2rc&hl=fr_FR&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/8Gg6mh6j2rc&hl=fr_FR&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385"></embed></object>[/u2b]