I can't speak for other exhaust systems, but I have the AWE Touring Non-Resonated cat back, with Kooks Headers.
Sucker is loud!
No drone, and the loud is a nice loud. I talked with my neighbors and they all said it sounds good, not bothered by it.
One neighbor was able to tell me what time I leave every morning for work!
He also said when I get on it, he can hear me on the hwy about a mile away.
Others have asked if my car has a cam because of the sound...no cam.
One person who only heard it, but didn't see it at first, thought it was a Z06!
I can only imagine what it will be like with a SC and a cam...some day I may find out!