[jrussell]

Josh,
What brand of car are you getting? Almost all have a different header/sidepipe/muffler setup, and they differ quite a bit in noise level. I can tell you that the quietest youf car will be is when it is new, and it will gradually increase as you drive it, however you most likely will not notice it yourself, and it truly does depend on you and your own self control of your right foot! Your car won't be earth shakingly loud like a AA Fuel Funny car ever, but it will most likely be louder than almost anything else around other than certain motorcycles, but the tonal quality will be much lower.
My feeling is that you will be immediately in love with it the first time you hear it fire and settle down into its own low rumbling idle.
Enjoy the moment because there is NOTHING like it.
John Russell- with over 13,000 miles on my 460 and loving every minute of it!