I had these on my car with the stock OAPs with the resonators still in place and Corsa extreme quad tip axle backs. It was loud but I loved it and had no drone at all.
Originally had Magnaflow street axle backs and it was a little quieter but the Magnaflows made it drone something awful at 80mph.
I've heard a local guy with that setup. It sounded good at idle with his cam tune but when wot it sounded like a raspy tin can "noise". I didnt care for it but just my .02