K&N 57I-2501

57i Series Kits > Performance Intake Kit
List Price: $354.35
Your Price: USD $194.99

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K&N 57i Generation II Induction Kits are built primarily for European vehicles. They come with K&N's Million Mile Limited Warranty™. These intake kits use only non-metallic rotationally molded tubes that can reduce air temperature and decrease intake sound over a metal tube. Restriction can exist BETWEEN an air filter and the engine reducing the benefit of a K&N Air Filter alone. The weakest link in the airflow "chain" robs a vehicle of its natural horsepower. Often that weak point is the factory air path leading to the engine. K&N Air Intake Kits virtually eliminate air path restriction by replacing the air filter and the entire air path to the engine. The aerodynamically engineered tube drives a massive amount of air into an engine, which translates into POWER. 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]
  • Guaranteed to increase horsepower
  • Designed to improve throttle response and engine sound
  • Replaces entire factory air intake system
  • Washable and reusable lifetime air filter
  • K&N Million Mile Limited Warranty
  • Lasts up to 100,000 miles before service is required (depending on driving conditions)
  • Easy to install, usually in 90 minutes or less

Product Specifications

Air Filter ColorRed
Air Filter Height4.5 in (114 mm)
Air Filter Large End Diameter5.875 in (149 mm)
Air Filter MaterialCotton Gauze
Air Filter Outlet ShapeRound
California RestrictedNot legal for sale or use in California
Clamp MaterialStainless Steel
Clamp StyleRegular
Clamps Included6
Couplers Included1
Intake Pipe Color / FinishBlack
Intake Pipe MaterialHigh-Density Polyethylene & Flex Hose
Product Box Height10 in (254 mm)
Product Box Length20 in (508 mm)
Product Box Width10 in (254 mm)
Product Style57i Series International Kits
Replacement FilterRF-1005
Street Legal In All US States No
TUV Approved (Europe)No
TypeGen II
Weight6 lb (2.7 kg)

Customer Feedback

Be the first to review part 57I-2501
Wow I can't believe how good this air filter is. I drive a 2014 Ford Focus Hatch automatic with dual clutch transmission. I bought this air filter based on the recommendation of a friend. I really can't believe what a difference this air filter has made in my vehicle. This air filter has great improved my low end torque and acceleration. It has not made into a sports car but there definitely is a noticeable improvement. Periodically I would get that transmission stutter from the dual clutch transmission, not often but once in a while. With this new air filter I have not experienced that once. This air filter has worked so well I am thinking of investing in the air intake system for $299. There is no reason you shouldn't have on of these filters in your car. A life time part for $60. Instead of paying $20 every 10,000 miles. This really is a no brainer.

Boston, Massachusetts
Replaced the stock air filter on my 2001 Ford F150 with a K&N replacement filter. I noticed an immediate increase in responsiveness and from the first full tank an increase in my gas mileage. Since this is vehicle is used more around town the gas mileage is low but I increased by at about 2 MPG. Considering a standard air filter cost about $40 per replacement this will be a financial savings after two replacements. I typically replace the filter ever 8k miles since I do some dirt road travel, this will be an easy wash and reinstall. Highly recommend these filters, should have done this sooner. I have replaced the standard air filter on my 2014 Dodge Charger with the same results and will replace the filter on my daughters 2013 Ford Focus shortly.

Windham, New Hampshire
I love this air filter, the way it makes my 2014 Ford Focus ST sound and perform is amazing. Can't thank my amazing girlfriend enough for getting me this, this past Father's Day. Awesome product.

Paul Waters
Houston, Texas