I dont know about the 4.7l but I have a 3.7 with the super 44 (front reso still on, turn out in front of the rear passanger tire). It has a great sound outside, but it is not loud inside the cab at all. Gives the truck just enough grumble to sound like it has some b*lls, you hear it barely in the cab. Stock set up was way to quiet, I had actually tried to start the truck twice before I had this set up put on. I have a before and after video posted in the forums.

 

search under user ozone45212 and look for my post before and after vids (new exhaust!)

 

You think that FM drones now? Wait until you have about 10,000 miles on it.