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Basically the K&N allows more air to pass than a stock air filter. The only downfall with that is that the K&N doesn't filter out as small of micron dirt and pollen pieces as what the stock filter would do. The great thing about them is you wash them and re-oil them when they get dirty so you don't have to replace them like a stock filter all the time. As for true gains, I've got them in 2 of my vehicles (soon to be in 3 of them) and I love mine. I don't notice a big improvement in milage or power, but just the ability to clean and re-oil them is well worth it for me. The only time I wouldn't recoment them is if your in a terrible dusty enviroment, then your going to plug the K&N very fast and your washing it every month. Also in you get a K&N, it's good to keep a stock filter on hand for when you wash your K&N, you can thow in the stock filter to get by untill your other filter is ready. Every person will have a different story on wether to use a K&N or just to stay with a stock filter so it's really up to each person. Here's a little history on the start of K&N and why they were invented. My boss used to be an engineer for Stihl (the chainsaw company), and when Mt. St. Hellens blew in 82' ?? (I think that was the year) the ash in the air was clogging the chainsaws so bad that the loggers couldn't get any work done. So K&N came up with their washable filter and now we have them everywhere. Just though I'd share that with everyone!
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1988 Wrangler, 2000 Cherokee Freedom Edition,
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