Don't know anything about BBK, but I just put Bassani axle backs on mine and love them. The first trip they seemed to have a little drone, but that seems to have went away after they broke in a little. They are a nice deep sound and seems to have helped in performance a bit to. I am not going to claim they made it into a 5.0 or anything but there is difference in power.
I was searching everywhere for the "best" exhaust and all that. Came across a video of the Bassani's and loved the sound. They are also on sale at American Muscle this month so that is a plus..