I actually WENT to aFE for my 4.6. They were concerned about the hose that goes into the stock airbox. They said the 4.4 didn't have this hose, but someone here posted pic's of a 4.4 with that hose just disconnected.

I ended up just getting a K&N panel since I won't pay Dinan's prices. I just sent aFe an e-mail about an intake for the 4.6, but they still don't have anything.