I never liked the way BMWs sound. Even the E39 M5 fell short of sounding like a true rumbly V8.
A proper big displacement V8 paired with an aftermarket exhaust (and perhaps a cam

) should vibrate the ground at idle when you're standing next to it. You guys have been to dragstrips, you know what I'm talking about.
Here's still my favorite one:
http://videos.streetfire.net/video/G...otor_29032.htm