To get back to GarryE's original post - you may wish to have a look at Michel's 500SL AMG - whilst I am not sure, I suspect that his car is fitted with extractors. The exhaust sound is quite, shall we say, intoxicating - just keep on easing off the throttle, and re-apply - it puts a smile on your lips each and every time.
I don't know, Garry, what system you have on your car - I do know that 350s can sound quite roarty - on those, the original muffler is a very shallow affair and, some years ago, I decided to fit a 350 first muffler to GLeaming Beauty. It did eventuate in a slightly more raspy exhaust note, but the large 6.9 end muffler certainly greatly restricted the music coming from the exhaust pipes. Thus, some little while ago, I did away with the huge rear muffler and had Merrylands Exhaust fit a beautiful, straight through item in its place, with straight twin pipes emanating from under the rear apron. A bit like Oversize's muffler system, the exhaust note resembles that of a helicopter (yes, that's right), but it doesn't sound quite as gruff as Oversize's. It certainly is, mind you, somewhat throatier than the system on Michel's Red Terror. Regards Styria