I truly do not know. Do a search on the web for aFe. Call their number and talk to someone in tech support. I believe the guy's name was Michael(?).

He informed me they had problems with something nside the stock ductwork about this "flap" or "valve" that made it overly difficult to adapt the aFe CAI to the 4.6.

this is even though they have kits for all other models. Everyone except the 4.6. Dang!