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aFe Magnum Flow OER Pro Guard 7 is a drop-in factory replacement air filter that assures the best filtration for the Jeep Liberty. This filter features the Pro Guar 7 media, a combination of 5 layers of cotton gauze and 2 layers of synthetic media. It results in better flow, up to 45% better than stock, and results in more horsepower and torque output. The construction of the OER Pro Guard 7 also features a full urethane body, progressive bump seal to prevent leaking, and rounded open pleats for maximum filter area. The aFe Magnum Flow OER Pro Guard 7 is also easy to install, reusable, and covered by a Limited Lifetime Warranty.