The only other cat backs I have had were flo-masters and they were on a 5.0 so I don't have much else to compare it too. They have a deep sound that is not raspy or rattly. I like it! I have a movie of a couple of small rev-ups and another of it just idling but I don't have a way to host them so I can't post them for you all to hear.
I just dyno-d mine with BBK LTs, BBK OffroadX, Magnaflow CB, Steeda U/Ds, Modular Depot P&P upper plenum, and Accell drop in air filter. Got 260 RWHP and 298 RWTQ. Standard numbers were 271 RWHP and 311 RWTQ.
matt
my stock baseline was 232 RWHP and 274 RWTQ (SAE).