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richard said:Hey does any one have a good recommendation for an aftermarket air filter for alittle more horse-power and better breathing for my liberty?I've used the k&N drop in filter in almost every vehicle I own. If you're looking for horsepower, I've never found an air filter to do the trick. You know how your vehicle always seems to perform better after you change the oil? Same theory applies to an aftermarket air filter. Best hope would be for a slight improvement on gas mileage.