I have 3900 miles on my 2007 S4 sedan. I have been waved down or questioned 11 times since my purchase. Most simply heard the exhaust after I passed them and wanted to know what exactly was I driving. It is unexpectedly fast and extremely low key relative to its looks. The exhaust note is spectacular for a relatively small V8. A nice throaty rumble at idle and a tight controlled roar at its redline of 7000 rpm.