The World's Best Flowing, Best Filtering, High Performance
"Street-Legal" Air Filtration Systems

In the K&N tradition of engineering power, the K&N Fuel Injection Performance Kit (57i Kit) dramatically reduces intake restriction as it smoothes and straightens air flow. This allows your vehicle's engine to inhale a larger volume of air than the OEM air filter assembly. More air means more usable power and torque throughout the engine's RPM range, with even greater power gains in turbocharged and supercharged engines. 57i kits are available for many popular performance vehicles, and are designed to replace the original air filter case without jeopardizing important emission standards. Exempted by the California Air Resource Board, 57is make it possible to experience the rapid acceleration of enhanced air flow. These 57i kits are washable, reusable and backed by K&N's unique 10 year Million Mile Limited Warranty.

THE 571i DESIGN CONCEPT:
The 57i was designed to promote performance in fuel injected stock engines by creating air filtration with the least resistance in air flow. The benefit of low resistance air filters can be felt directly in throttle response. In addition to the filter, these kits have uniquely designed adapters. These adapters create a radius entry which reduces restriction and allows the engine to ingest an even greater volume of air. To design such an assembly, two factors must be considered: the air filtering element and the air filter adapter. The 57i combines a precision high flow K&N air filter element with other necessary components, depending on the specific application. K&N's Generation II represents yet another evolution in air intake technology. These break-through engineering designs contain all the performance improvements you expect from K&N - but with even greater benefits. What is truly remarkable about the Generation II kits is that they consistently achieve incredible horsepower gains even under varying atmospheric conditions. This process is accomplished by replacing the entire air intake tract, thus isolating the cold air and directing the air through this truly unique chamber delivery system. This process may or may not include a heat shield. In fact, during testing on a Jeep Grand Cherokee we had repeat gains of 26.3 horsepower. We also have dyno test results showing torque increases through the towing ranges of no less than 23 ft. lbs.

THE 57i EFFECT:
Replacing the O.E.M. factory air cleaner assembly with a precision engineered K&N 57i or the Generation II, will provide fully maximized air flow potential, creating an instant throttle response to please any performance enthusiast. Because they meet the standards of the C.A.R.B., 57i come with a high temperature label that contains an E.O. number. 57i's are the results of K&N's Engineering vision and excellence: the vision to create environmentally sound performance products and the excellence to stand behind those products. To ensure all the power and performance that your fuel injected engine is capable of giving, install a high quality K&N Fuel Injection Performance Kit (57i) and feel the power in the air! What does this mean to you? You get better acceleration, instant power, and ease in lane changing and passing even while towing by installing our 57i Generation II. K&N gives you performance that will last for 10 years or one million miles, and we guarantee it!