I just cast my vote for no drone; although there is a small amount of steady resonance at 75-80 mph. I'd descibe it as a smooth sound. Its really not loud at all. I was expecting it to be a lot louder. Honestly at some city traffic speeds the overall sound seems quieter than stock, but then the sound ramps up with heavy throttle input. Also the perceived noise output has shifted towards the rear of the truck. It only really sings when I step on it. I'm undecided though as to if I like the new sound or not. Part of me kinda likes it, and part of me resents it for sounding more like a V6 Mustang with aftermarket exhaust. Still, it might get really interesting with a Magnaflow Direct Fit muffler.