I just got rid of my AFE and went back to stock and I can't really tell the difference. When the AFE was a little plugged, if I set my edge juice to level 3 and stepped on it hard, the overhead console would chime in and say to service air filter. If I set it on level 5 even with a clean filter the service air filter would show up. That was with the AFE air box that has a hole out the bottom to a hole in the front to help get more air in the box. I changed back to the stock set up two days ago and I have played around with it and set the chip to level 5 and floored it and I don't get the service air filter warming. As far as I'm concerned and from what I've read here, the stock box is good to about 500 hp. I just bought some 4" black pvc pipe and some fittings today front home depot to do a similar thing that the PSM part does. Only I'm using a toilet flange to bolt to the bottom of the air box and solid pipe to go down and a 45 degree elbow at the bottom and I will make it so that it just sticks down below the bumper about a 1 1/2" or so facing forward so that at highway speeds it will actually catch some air and for sure create a possitive air pressure in the box. I also found that a 4" screw in cap also from Home depot fits into the top of the toilet flange hole just right, a little snug so that it can be used as a plug for the pipe in the winter as I don't want the snow in there and don't need the cold air either at that time. I did the same thing on my last truck and I kid you not, the egt's dropped by 80 to 100 degrees in the summer with it open and I had actually made an aluminum scoope that was 4" high by 10" wide and it was mounted fully under the bumper to catch alot of air. I never had water problems when driving in the rain. I may do that to this truck also when I have time this winter to do a little aluminum work.