I noticed that everyone on this site seems to swear by the AFE and K&N CAIs but I never hear anything about AIRAID. I personally have an AIRAID CAI and I love it. I have alot more throttle responsiveness and I get about 1.5 MPG more with this than the stock intake. I also offroad my truck and have found that they way the box is made on the AIRAID it really blocks mud and all the bad stuff from getting in to my engine. I am at work now but will post some pictures later when I get home of it installed on my truck. I also sealed the hole that the stock intake made in the wheel well using rubber gasket material and RTV sealant.
Here is what the intake looks like in the truck
Here are some pictures of how I sealed the whole that the stock intake made in the wheel well so that mud wouldnt get in the intake