I care about performance...the wife does not. She does, however, care about excessive drone/exhaust sound. Having had an F250 with bad drone, it's difficult to hear anything in the back seat. I imagine that problem is magnified with the expedition cab. When i'm not in my truck, my daily is a SS camaro, so the stock Expedition feels like a tank to me. I'm just wanting to pick up some extra power. 5 star has posted videos and dyno runs with this as a part of the setup and that's about the range i would like to be at. I have found nearly no info or reviews on the sound which led me here. I'm not too worried about the muffler. If it gets worn out, i'll get another one.