Hey, I'm pretty new here, but I bought a Cold Air Intake Kit from a seller on ebay. I have a 2003 v6. The kit was about 30 bucks plus 25 for shipping. The kit was complete except the guy sent me a wrong fitting, which he replaced for me for free. The kit works great. Even the filter, its a replica of a K&N, and i actually wanted to buy a k&n filter for the kit, which is like 45 bucks alone. But I bought the one that came with the kit0 along with me and the guy at Car Parts said that it was just as good as the K&N and wasn't worth spending the extra money. The kit makes a really cool sucking sound when u give it some gas, and it looks really really nice under the hood. I've heard that they do give you slightly better fuel economy but personally I haven't checked. Hope that helps.
Also, most of the kits that come from ebay come with no installation instructions, but if you just search online there are plenty of places that have step by step instructions.
Hope this helps!