I mounted this exhaust on my Chevy 3500 with 454. Had to retrofit it as Flowmaster doesn't design a muffler for this truck. But I've double ridden with two of these mufflers and I'm very happy with the sound. Not too loud. Very little self-resonance and no hum. Great healthy sound. I would give ten stars if I had the choice. Also, it arrived a day before the estimated date which was a big plus as impatience runs high once you check out.