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57-0446
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MSRP $276.69 45.1% Off
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K&N 57-0446 Air Intake

57i Series Kits > Performance Air Intake System
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   5.0 out of 5 stars   3 Customer Reviews
  • 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®
The K&N 57-0446 Air Intake fits some BMW Z3 models. See vehicle applications link for details.
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

Replacement FilterRC-4500
Air Filter ColorRed
Air Filter MaterialCotton Gauze
Air Filter Outlet ShapeRound
Clamps IncludedNo Clamps Included
Clamp MaterialNo Clamps Required
Clamp StyleNo Clamps Required
Couplers IncludedNone
TypeGen I
Product Style57i Series International Kits
Air Filter Height5.125 in (130 mm)
Intake Pipe Color / FinishBlack
Intake Pipe MaterialFlex Hose
Street Legal In All US States No
TUV Approved (Europe)No
Flange Inside Diameter2.75 in (70 mm)
Flange Length0.75 in (19 mm)
Flange TypeOffset
Height5.125 in (130 mm)
Base Outside Diameter5.188 in (132 mm)
Top Outside Diameter3.5 in (89 mm)
Top StyleMetal
Top MaterialChrome
Weight1.9 lb (0.9 kg)
Air Filter Large End Diameter5.188 in (132 mm)
Product Box Height9 in (229 mm)
Product Box Length9 in (229 mm)
Product Box Width9 in (229 mm)
California RestrictedNot legal for sale or use in California
Mounting Hardware IncludedYes
WARNING: Cancer and reproductive harm--www.P65warnings.ca.gov

K&N 57-0446 Air Intake Product Reviews

Tuesday, May 2, 2017 - Part 57-0446
Very easy install / instructions. Works great and worth the buy.

Erin Collins
Marion, Ohio
Monday, July 6, 2015 - Part 57-0446
Beautiful throaty sound. Noticeable difference in acceleration at 2000rpm and above.

James Pinion
Tennessee
Monday, March 23, 2015 - Part 57-0446
Easy to install after removing the original air box and tubing.

Tom Thompson
Beaufort, South Carolina