I did a baseline dyno on my '06 coupe with 700 mostly easy miles on it and pulled 434 hp and 465 torq. I was a bit disappointed at these numbers. I then installed the Mopar race exhaust, race engine controller and K&N intake system with a dyno run one week after the baseline above. Results: 447 hp and 482 torq. Again I was disappointed because I expected more. As far as the sound is concerned, again I was somewhat disappointed. I compare it to my '96 (which,to me,has the best sounding exhaust I have heard) and it does not have nearly the low pitched rumble at idle nor the bad ass roar with acceleration. The '06 is loud but the quality of the sound is not what I had hoped for.
Hope this helps.
Bob K