I have stock cats, no resonator and a Magnaflow muffler. Sounds like a V8 plain n simple vs the oem setup which made no V8 burble at all. I love it and it only sounds louder than normal at say 35mph, 55mph, and if you get on the gas. All 3 of my LR's have that setup and I love hearing a V8 vs a Prius exhaust!

 

As soon as funds allow I'm going to put their cat back on my stock Cats. Love the sound
It sure seems softer than the Borla, that is surprising to me as Borla is traditionally the quiet one of competitors (minus the atak of course)

 

Took a long test drive today, and the cats worked great. I had been experiencing some intermittent rough idling, and the P0430 code for the cats. All are gone, ran noticeably better and seemed to get better gas mileage, but was hard to tell. Lots of traffic today.