It does sound amazing.
But... the M3 isn't a muscle car so the sound just doesn't match the image.
If an M3 is not a "Muscle car" I don't know what is.
It sounds great
- damn the Europeans for silencing it! 
CSL sound is godlike, get one of them tbh
I don't know of an M3 that does not sound Godlike.
http://www.youtube.com/watch?v=4y4RtUhwdO0 e30
http://www.youtube.com/watch?v=L0pboeAULvM e36
The e46 is great in either CSL or M3 and the new one sounds pretty nice imo as well.
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