Well the exhaust I have sounds deep when cruising and in low rpms. But in the high rpms, it sounds higher pitched. But sadly, that's what every exhaust is going to do anyway. You may be able to mimic the low tone of a v8 in the lower rpms but when you get into the higher rpms, you'll hear the higher pitch of the v8.
If you go to the link below and watch the last video, which is without headers, mine sounded exactly like that. Maybe a little deeper but the video was probably 99% accurate
http://www.camaro5.com/forums/showthread.php?t=112386