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I got the Airaid CAI. They all are pretty similar. Id wait for something to pop up used on here or ebay. Normally you can get a KN for $150-$200. I wouldnt do a DIY on my truck; I just think it looks much better when I pop the hood in front of mechanics and friends. (Plus the Airaid lets me use the bottom of the stock air box that I have cold air from the front bumper being pushed in to )