It sounds very tame at idle and under light acceleration, but it growls nicely under heavy acceleration. I do not feel any rumbling or vibrations at the wheel.
I listened to a lot of exhaust videos and in person before making my decision. I still think it is one of the best combinations for a little more noise without being obnoxious or raspy and it has zero drone at any speed.
This truly sounds like a simple cheap exhaust upgrade. Years back you could relate flowmaster = drone with most of there muffs.