Well, technically the install is not complete. Whoever packed the box at Gibson put two passenger exit pipes in the box. These are the 90's that are about a foot long that turn behind the tires and what the stainless tips attach too. Upon first startup I was not very impressed. I knew it would be mellow at idle so I put it in drive and went down the street. It still wasn't as loud as I thought or wanted it to be. I came home and parked it and put away the tools. So yesterday I went on a little trip, maybe 60 miles round trip and over time it seemed to have opened up a bit. It's still on the mild side but it's definitely noticeable. I'm thinking part of the issue is that the sound is still trapped under the truck rather than exiting through the tips. I'll be calling Gibson to have the drivers side exit pipe shipped out.