Here is a video and an audio clip, 1st is wimpy 2nd is crazy. You get the idea though. haha
Or type (Flowmaster Original 40 Ford Epedition 1st gen 4.6L) into you tube
http://www.youtube.com/watch?v=elg7Zd-AW_M
http://soundcloud.com/dr3w4003/000101-0128
Epedition?????? Really. C'mon.