It's kind of hard to really explain a sound to you. It is a deep sounding rumble? The more I push down on the pedal they louder it becomes until the supercharger kicks it then it gets considerably louder. But not that loud to shatter any windows of course. A deep mellow sound you might say. Cats & mufflers were new when I did the system. My opinion is that when I went to the 3" pipes that is where I gained the louder system.