K&N 57S Performance Airbox

K&N 57S Series Performance Air Filter Box
  • Guaranteed Horsepower
  • Complete Air Filter Box with Air Filter
  • The World's Best Air Filter
  • Easy Installation
  • Million Mile Limited Warranty®

K&N 57S-9500 Air Filter Box

Guaranteed Horsepower

Aerodynamically designed to increase airflow and reduce turbulence, providing up to three times the power gains from a K&N Replacement Air Filter alone. We will not sell a 57S air filter box system that does not provide a measured increase in horsepower and torque (acceleration). Each system is proven to increase vehicle power at the wheels on a dynamometer (think treadmill for cars). These thoroughly engineered systems provide huge increases in power that a customer should feel when they accelerate. Typical gains on an 4 cylinder vehicle range between 4 and 7 horsepower. We have even tested engines that provide as much as 11 extra horsepower.

Complete Airbox Assembly

Replaces the factory air filter housing with a fully enclosed injection modified air box to reduce sound and cool air. The airbox comes with a removable lid for servicing and a custom engineered Velocity Stack (Velum) designed to smooth and straighten airflow for added power.

K&N's 57S-9500 Air Box

The World's Best Air Filter

The 57S Performance Airbox features a washable and reusable oversized conical K&N High-Flow Air Filter.

Easy Installation

Sounds complicated? That's the great part, these systems are easy to install. A typical installation can be done with a screwdriver, pliers and a ratchet set in 30 minutes. That's because we specifically engineer the kits to use factory holes and mounting points so they do not require any cutting or drilling. Our 57S Airbox is factory pre-assembled and custom designed for specific vehicles to fit right into the engine compartment.

K&N Million Mile Limited Warranty®

K&N invented the world's first air filter guaranteed for one million miles. That same warranty stands behind our 57S Performance Airbox. Engineered with care and passion, these systems are built to last for the life of your car. We stand behind them completely.

Some K&N 57S Airboxes are fully TÜV compliant

TÜV Compliance

Some K&N 57S Series Performance Airboxes are fully compliant with the latest TÜV emissions and sound regulations. Check the vehicle applications information below for the specific TÜV status of each vehicle and air intake.

K&N 57S Performance Airbox Specifications

Our 57S Performance Airboxes are special air intakes developed by K&N, the inventor of the Million-Mile High-Flow air filter. These systems increase horsepower and acceleration by dramatically reducing air flow restriction caused by the original factory design. A K&N 57S typically replaces the factory air filter box and filter with upgraded high quality components. A 57S uses a fully enclosed air box assembly with a removable lid for easy access to the filter when cleaning is required. The 57S air box is injection molded for extra strength, consistency and durability. The 57S assembly is large enough to house an oversized conical K&N High Flow air filter and the entire product is backed by our Million Mile Limited Warranty. By reducing both air filter and air box restriction, these systems provide up to three times the power gains available with a K&N replacement air filter that go into the factory air box. The weakest link in the airflow "chain" robs a vehicle of its natural horsepower. Often that weak point is the factory air box itself, a problem K&N has solved with the 57S.

K&N 57S Performance air filter boxes are injection molded from the same materials used in factory air boxes. Once installed, you will have a performance system with a factory appearance that looks as good as it performs. A 57S comes factory pre-assembled and has a removable lid to make servicing the washable air filter simple. Inside the 57S is the largest conical shaped high-flow air filter we could fit into the system while still using factory holes and mounting points. This extra filter size provides even more airflow at lower restriction than a standard K&N replacement filter that is limited to the size of the factory air box. The oversize air filter also captures and holds more dirt increasing the service life before a cleaning is required to 100,000 miles under normal on-highway driving conditions. The air filter box assembly is connected to the engine with adapters made from high strength materials such as silicone and reinforced nylon that ensures long life.

Additional Information about K&N 57S Airbox Systems

Vehicle applications for the 57S-9500 Performance Air box

Vehicle applications for the 57S-9501 Performance Air box

Vehicle applications for the 57S-3300 Performance Air box

Vehicle applications for the 57S-4000 Performance Air box

Vehicle applications for the 57S-4900 Performance Air box

Vehicle applications for the 57S-4902 Performance Air box