K&N Performance High-Flow Engine Air Filter: Washable, Multi-Layer Protection, Engineered to Boost Horsepower, 33-2363

2009 Dodge Nitro 3.7L V6 SLT Removed $17 - $22 FRAM Extra Guard "Paper" Filter. FRAM "Paper" Filter became bent. Disrupting PROPER Air Flow through BENT Filter Slots. (Choking Horsepower WHILE... DESTROYING Fuel Economy) AFTER Installing K%26N Premium Washable High Performance Air Filter ECU/PCM (Vehicle Computer "Brains") Reprogramed A/F Air Fuel Mixture and Fuel Trims. My Nitro went from almost CHOKING and DYING to PEACE. So quiet, so SMOOTH on the Throttle, INSTANANIUOS POWER I had NO IDEA the Nitro "Truely" was STARVED from Factory. FRAM "Paper" Filter: Drive Test (BEFORE): 55-65 MPH /// Cruise: 2,500 - 3,500 *Due To: "RAPID" Paper Structural Failure CHOKING air flow!!! *Running RICH dumping fuel destroying Fuel Plugs and Catalytic Convertor. K%26N HIGH Performance (AFTER): Speed: 55-65 MPH RPMs: 1,750 - 1950 RPMs *Gained Between: 1-3 MPG!!! (Depending on Cruising or "Performing") *Smooth Engine with Amazing MPG for Next 10 Years!!! *Throttle Response CAN BE Felt Instantaniously. *K%26N Hi.Per. Filter REMOVED my 02 Sensor Codes !!! [NO LIE] BEST $65 Invest and Warranty Replacement for 10 Years!!! Thanks 4 Wheel Parts (4WP) for Fast Processing and SUPER FAST Shipping!!!

2011 Jeep Liberty Renegade 3.7L, 4x4, trail rated has a real world city driving increase of about 1.6 mpg on the uphill / downhill area driven. Haven't taken it out on the freeway for a long trip yet but if the city driving is any indication, I would expect highway mpg to possibly increase by about 3+ mpg. Jeep KKs & JKs do not get good mileage because of the non-aerodynamic (flat) front end, low gearing and extra weight from under chassis skid plates so this is a pleasant surprise. Low end acceleration has a felt increase, especially from a standing start on a 5% or more uphill grade, without sacrificing the increased mileage. Because of the increased engine performance, the transmission shifts faster into the next higher gear and holds the gear longer under load. I would buy another K&N air filter for any vehicle I own.

I ordered the air filter for our 2012 Jeep Liberty. It arrived very quickly. I have used a K&N filter on my 1994 Wrangler and was very happy with it. I will be ordering one for my 2009 Jeep Wrangler 2dr next.

made a marked difference in the fuel mileage and power in my 2011 jeep liberty.

Even in my jeep liberty i can feel the difference. 5/5 would recommend

It's reputation speaks for itself!

Filter is as advertised. Cannot tell if getting better mileage since it is winter in Idaho.

Works good.