I have it, and I like it. I will do my best to get a sound clip from the phone. I mine daily, and although I wanted the thermal option, I found it to be too loud. One thing that I find strange is that at wide open throttle (WOT), it sounds like a jet engine or a leaf blower. I guess that's just the sound of the V6 turbo. The startup is nice, and the idle is cool.
As for cabin noise at highway speeds, it's slightly louder than factory—just a bit. When going up a steep hill, you do get more noise, but I enjoy it. The only downside is that my wife dislikes the modifications I've made to my Explorer. Another issue is that you need to cut your exhaust pipes at the right spot to get them to line up correctly. If you're off by just a bit, it can mess up the angle at the back. It's better to cut less than more.