Here is a video clip of a cold start the day after I added a Flowmaster Super 10 to my 2020 5.3 Silverado. All I had done was a muffler swap. Original pipe with mesh resonators is still in place. Sounds great and aggressive when accelerating and starting up but not too crazy when cruising. Haven't taken a long highway trip yet so not sure about drone on a long trip but I have been on short highway trips and the drone is very, very minimal, can't even hear it when music is playing.