I have an 01 L. I added a Airaid box with K&N filter to my truck, (I also added a hose going to the front bumper.) flip chip and it ran slower. The chip has a summer, winter, and stock. Tryed them all. Then used the Predater still slower. Turns out the Airaid box is for a 80mm & not the 90mm maf. The box seals to the hood so most of the air is comming from the fender or the hose I added.
I'm going back to the stock box with hoses running to the bumper.