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K&N 57-0252 Air Intake

57i Series Kits > Performance Intake Kit
  • Guaranteed to increase horsepower
  • Designed to improve throttle response and engine sound
  • Replaces entire factory air intake system
  • Not legal for highway use in states adopting California emission regulations
  • Washable and reusable lifetime air filter
  • Lasts up to 100,000 miles before service is required (depending on driving conditions)
  • Easy to install, usually in 90 minutes or less
  • K&N Million Mile Limited Warranty®
K&N 57i Series induction kits are specifically designed for each different vehicle and will free your car from the size restriction that comes with the factory air box. These economical kits can take a variety of different forms based on vehicle characteristics and available space under the hood. Each kit is designed to provide power throughout the RPM range. The extra surface area of these open-air air filters provides even more airflow at lower restriction than a K&N O/E replacement filter which is limited to the size of the factory air box. The larger air filter also captures and holds more dirt increasing its service life before a cleaning is required (up to 100,000 miles). The filter is either directly attached to the engine carburetor or throttle body or indirectly through a tube assembly running from the filter to the engine. All adapters are made from high quality materials such as steel, aluminum, silicon or reinforced nylon to ensure long life. 57i Intakes are not legal for use in California and other US States adopting California emission standards.

[More Information on K&N 57i Induction Systems]

Product Specifications

Air Filter ColorRed
Air Filter Height4.875 in (124 mm)
Air Filter Large End Diameter4.688 in (119 mm)
Air Filter MaterialCotton Gauze
Air Filter Outlet ShapeRound
California RestrictedNot legal for sale or use in California
Clamp MaterialSteel
Clamp StyleRegular
Clamps Included2
Intake Pipe Color / FinishBlack
Intake Pipe MaterialFlex Hose & Rubber Hose
Product Box Height9 in (229 mm)
Product Box Length9 in (229 mm)
Product Box Width9 in (229 mm)
Product Style57i Series International Kits
Replacement FilterRC-9350
Street Legal In All US States No
TUV Approved (Europe)No
TypeGen I
Weight2.2 lb (1 kg)

Customer Feedback

This is for a Lotus Elise and the air box is hard enough to get to. It was difficult to get the box closed once the filter was installed. I think I am going to buy your cold air intake for the car. I use your filters in all my vehicles.

Cole Zimmerman
Phoenix, Arizona
Great to read all the testimonials, and I'd have to say that having used K&N filters all my days - I would agree with all the praise!

Now a bit older and owner of a Lotus 1.8 Elise S, I needed something to make this already special car even more exiting. So fitted the Apollo kit and must say that this is the best induction kit I have used.

The extra sound from the Apollo is only apparent when the gas pedal is almost at the end of it's travel, so there is no kiddy boy-racer sound to be had here!
Extra flexibility is evident throughout the rev-range, and the car pulls much more cleanly to the red line - just what I wanted!

Other kits don't come close when it comes to vehicle application suitability, and it is obvious research and design time/energy has been put into making this great little filter work for my car.

Criticisms would be the slightly cheap plastic which broke from its thread used in the 1/4 breather attachment (goes into the new moulded intake pipe) I fixed this with trusty 'ISOPON P38 easy sand'
Elise owners - DO NOT tighten this to the end of the thread.
The instructions- although detailed, should include removal of the wheel and inner wheel arch lining to access the air-box clips and mounting bolts, and for easy instalment of the new flexi-pipe which sits at the car's side vent.

Thanks K&N and good job once again!

Scotland, United Kingdom
Thank you. The filters were promptly received for my classic Lotus Europa Special. Rare application for 175 Stromberg carbs with custom housings. Outstanding service help on web page for correct application. Regards, L.D.

Lou Drozdowski