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57-0646
$228.99 USD
MSRP $415.59 44.9% Off
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K&N 57-0646 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   1 Customer Review
  • 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 57-0646 Air Intake fits some Subaru Impreza II 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-70031
Air Filter ColorRed
Air Filter MaterialCotton Gauze
Air Filter Outlet ShapeRound
Clamps Included7
Clamp MaterialSteel
Clamp StyleMini
Couplers Included1
TypeGen I
Product Style57i Series International Kits
Air Filter Height6.344 in (161 mm)
Intake Pipe Color / FinishBlack
Intake Pipe MaterialHigh-Density Polyethylene & Flex Hose
Street Legal In All US States No
TUV Approved (Europe)No
Weight5.7 lb (2.6 kg)
Product Box Height12 in (305 mm)
Product Box Length22 in (559 mm)
Product Box Width14 in (356 mm)
California RestrictedNot legal for sale or use in California
Mounting Hardware IncludedYes

K&N 57-0646 Air Intake Product Reviews

Tuesday, December 19, 2017 - Part 57-0646
Installation was very easy and simple. I was very surprised about the increased gas mileage I now have on my Subaru Forester. With the stock intake system I had about 20 MPG HWY. Now I have about 25 MPG HWY. The sound at high RPMs sound cool too. lol

Jeff-Rey Delator
Ewa Beach, Hawaii