Exactly what I was looking for! I have a 2001 Gasoline Chevy Silverado 2500HD that I installed this on and it's great! Not too loud in the cockpit, no more hum driving me crazy! I used to have a Dynamax and it was awful. I wish I had followed my intuition and bought a Flowmaster straight away! Sounds good. I wanted an exhaust that screams when it should and then shuts off on the freeway and that's almost what you can get!