That C63 sounds so much better stock too than the F10 M5!! A N54 335is actually sounds superior imho.
And for the person that was defending the F10 M5 sound just because it's a turbo - check out the E63 AMG V8 TWIN TURBO sound - stock and aftermarket:
Turbo:
NA:
Benz just blows BMW away in terms of V8 sound!!!