if you've got the facts you'd know the 4efe 4efte and 5efe are the same and that the 5efhe cams are the different/better ones also just because your friends adament theres a difference doesnt mean there is. like ricers who fit big airfilters and claim there 0-60 is down by a second im not acting smart im just telling it how it is, ive also had 5efe cams and 5efhe cams in my old n/a the 5efhe are the ones that make a difference, your probably using those