It's not so much of an exhaust brake as a reverse turbo brake. It produces RHP (reverse horsepower). On my 2016, from the research I had done, it was about 75 RHP. I found an add on somewhere that increased that to 150, but even though I tow a 16000 lb trailer, I don't tow all the time, so I didn't get it.
I had asked the same question on my earlier Rams. I've looked far and wide, but never found a solution to make it louder.
I have talked to several mechanics who recommend running it all the time, unless you're just cruising for long periods of time. When you come off the throttle, it fully deploys the vanes in the turbo, which keeps them able to go through their full range of articulation. Plus, it sounds cool.