I will have a larger write-up as part of my Ram Air Flow Intake/Mopar Catback Exhaust review that I started back in early-Dec but here are some notes I sent to a member who was asking.
The sound is great, the video above gives you a solid listen to the different scenarios but I'll include an outside and inside video with db readings below. Here are my experiences so far: 1) It's a loud exhaust (believe Porboy or someone said if you don't want sound, stay stock). Cold start will feel like you're waking neighbors, get on it and everyone in the vicinity will know you're moving...however, in the cab it's surprisingly "refined." My wife, who hated this truck when I got it and will look for any excuse to mock it, has not complained riding around, she even was defending the sound/volume when I was worried about my early mornings and the neighbors. At radio volume 6, you can hear the exhaust riding around in the cab, at 8 it mostly disappears into the background and you're not sure if its a bass line or the exhaust, at 10 its completely gone at normal cruise and even stop/go around town. I have not found any examples of drone and I suspect you won't with the Mopar one since that is probably their biggest concern with an "aftermarket" system under the Mopar name. However, as someone stated above, sound is subjective and maybe someone else will be like"all I hear is this thing in the cab!" or something along those lines.
Lastly, I have not towed with it yet so I'd lean on someone else if anyone plans to do that often. I might be worried about loudness in the cab towing something long distance because if you're stuck at 2500 RPMs for an hour, you'll hear it, but I have zero experience.
Overall, I love it. It make's it so much more fun to drive. I am still worried about the neighbors when I leave at 4am but no one has complained yet so I guess I have that going for me.
Sound
Done on an iphone XS using Decibel X software and not meant to be accurate as to actual DBs but merely show difference before and after
Before Recording 12/16/19
Outside: 80.0 Max (55 degrees, 44% humidity, mic centered 5ft from exhaust at 4ft from ground)
Inside: 68.2 Max (0-50mph, medium acceleration, no radio or fan speed, windows up)
After Recording 12/21/19
Outside: 97.0 max (52 degrees, 43% humidity, mic centered 5ft from exhaust 4ft from ground)
Inside: 74.2 max (0-50mph, medium acceleration, no radio or fan speed, windows up)
The outside numbers are slightly misleading so I will caveat them here. The max DB is the initial bark of the engine starting. It's loud like I said previously, but it immediately drops lower and then settles at ~70 for the stock, and ~82 for the after.