MKW:
The BMW M5 is now twin turbo'd and has a manacing V8 growl, so I have always wondered why 911 Turbos are so docile sounding, even the S models. (Conventional thinking is the turbos muffle the flat 6 sound. )

 

Sure, but imo, the M5 turbo sounds artificial; overdone. At least, judging from the videos posted here recently.