Love my Carven Competitor Catback. I still get compliments on how it sounds. Not too much drone at highway speeds.
Now, if you disable the ANC, then yeah you will hear a big difference. At a certain RPM it gets loud in the cabin, but doesn't bother me as its not cruising speed RPM's...more to do with acceleration. Guessing having soundproofing installed for the entire rear bottom and back of truck might have done something as well.
It's worth it though. Used to have a Borla S-Type Catback with X-pipe on the 5.0 Mustang, and I still think current Carven setup is better.
Note: You will get irritated hearing MDS cut on and off to the point you disable it. Warning that goes for any aftermarket exhaust.