I have an 04 gmc sierra 1500 with a 5.3 liter v8. I was worried that the sound would be too loud because the borla muffler is much smaller than the factory muffler, and the borla has a pretty much straight thru design. My exhaust pipe is 2 3/4 and this muffler is 3 inch, so after making my cuts there was a small gap to fill. I used two 6 inch long exhaust adapters which I could sleeve to any depth which made up for the shorter muffler size.after installing the new muffler, I was very satisfied with the sound. Its a nice deep low sound which doesn't drone out on the highway. I can listen to music on low volume and not even notice it. However, when I romp on it, it puts out this low tone, throaty, almost shredding noise yet it doesn't carry all over town and echo off of buildings like you see on other trucks.It provides that very traditional borla noise that I was hoping it would, and for the price I would definitely buy it again. This is my second borla product...