I love it. It's dead silent when driving easy, but it really opens up when you stomp on it. As for weird sounds, I did notice a "thunk" when I left off the gas. Took it into the dealership to confirm, it's just the blowoff/bypass/whatever, but they said it's normal, just more pronounced with the aftermarket mufflers/intake. Again, it only does this when I abruptly let off the gas during heavy throttle, so it doesn't bother me at all. Sound clips can be found here
http://www.f150forum.com/f70/ecoboos...xhaust-147085/