K&N® 57-0558 - 57i Series Generation I Induction Kit

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K&N® - 57i Series Generation I Induction KitK&N® - 57i Series Generation I Induction KitK&N® - Street LegalK&N® - 57i Series Generation I Induction Kit - Installation InstructionK&N® - Cleaning GuideK&N® - Done In House 602x420K&N Authorized DealerK&N Special OffersK&N Special OffersK&N Special Offers
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K&N Air Intake Systems

57i Series Generation I Induction Kit (57-0558) by K&N®. This induction kit is an easy and inexpensive way to increase airflow into your engine. It replaces your restrictive factory airbox with a free flowing K&N air filter. Increasing airflow will make more horsepower and torque, resulting in better acceleration. Replacement Filter # RC-4550.

Notes: Not legal for sale or use in California.

K&N - F.A.Q.K&N - Air Filter CleaningK&N - Warranty


  • Guaranteed to increase horsepower
  • Specifically designed for each application
  • Works with OEM computer system
  • Economical way to improve performance
  • Includes the world’s best air filter, the K&N filter
  • Easy to install
  • Street legal in most States
  • Up to 100,000 miles between servicing
  • Million Mile limited warranty

Your OEM air induction system is a compromise between induction noise considerations, underhood space limitations and engine airflow requirements. Replacing that system is an easy way to improve engine performance. Increasing the airflow and air volume into your engine will result in more horsepower and torque and possibly more miles per gallon.

The heart of the 57i Series Induction Kit is the world famous K&N air filter. The kit includes the largest air filter possible for the application, much larger than the size restricted filter that came in the factory airbox. The K&N air filter's increased surface area provides less restriction and more airflow, while capturing and holding more dirt. Depending upon the application, the filter is either directly attached to the throttle body or indirectly attached with a flexible tube.

K&N uses a dynamometer to design its air intake kits to make the most horsepower possible. But their power figures aren't based on just one vehicle, but rather an average of runs by a number of vehicles. This means repeatable numbers and horsepower claims you can count on.

Every 57i Series Induction Kit comes complete with everything necessary for installation, including comprehensive installation instructions. All adapters are manufactured from high quality materials such as steel, aluminum, silicon or reinforced nylon, to ensure long life. The K&N filter can go up to 100,000 miles before cleaning is required. And the K&N air filter is guaranteed for one million miles.

K&N® is the inventor and leading innovator of reusable cotton gauze filter technology for automotive applications. The first K&N filter was conceived for racing over 40 years ago and a performance enthusiast mindset continues today throughout all levels of the company. K&N is the sales and brand leader for performance filters, including an extensive line of factory replacement filters and performance air intake kits. The company actively promotes the environmental, economical and performance advantages of long-life reusable cotton gauze filters.

Part Number:

Vehicle Fitment

This part is compatible with 4 vehicle(s)
Year Make Model Fitment Notes:
2006 BMW Z4
  • 2.2L L6
2005 BMW Z4
  • 2.2L L6
2004 BMW Z4
  • 2.2L L6
2003 BMW Z4
  • 2.2L L6
K&N® - 57i Series Generation I Induction KitK&N® 57-0558 - 57i Series Generation I Induction Kit    $146.99
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