It is only when i am in gear...revving in neutral does not cause the noise. It does not seem to cause any performance problems. I only use premium gasoline and the sound comes from the engine bay. I think an exhaust leak might be something I should check. What I think I might do is head to the chrysler dealer and see if I can take out another crossfire to compare engine sounds. I am probably over reacting to the noise, but I am just obsessed with my new car and I want to be sure everything is in perfect working order.

Thanks for the advice,
Andy