Not sure if anyone has done this themselves, but I just did it on my 06 4.6l and it is feaking awesome.
Not sure how I can capture the true sound of it or even figure out how to post a video, but sweat mother of dog does this thing sound awesome. Totaly can feel the difference in the mid range power band, and with a tuner I'm sure it would be a completely different animal.
The guy installed it for $865.00 and threw in 2 5" stainless tips for free.
"Two half nuthin's is a whole nuthin, that's mathematics son, you can argue with me, but you can't argue with figures"