Got the K&N intake for my '03 and i gained 3ish miles per gallon and notice-able increase in power. Not nite and day different but good stuff when you lay it down and hear that low grumble it didn't have before. Worth the money for sure. I read on the forum that it would be loud, whistle sounds ect.. I have none of that, air off/radio off just listening and no weird sounds at an idle or at highway speeds. Forgot who told me about the seller on ebay express but that guy saved me 40 bucks, thanks, sorry i dont remember who ya are!