I'm posting this video I made of the difference between my 4" FloPro Exhaust system with and without the muffler because I had a hard time finding sound bytes myself when looking for an exhaust system for my 2016 Ram 2500 Cummins. It's not the best sound quality, plus it's vertical video with my iphone 7. Hope it helps someone, I added the muffler a few days ago because I got tired of the highway drone towing and the city raspy exhaust noise.