$228.99 USD
MSRP $414.89 44.8% Off
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K&N 57I-2501 Performance Air Intake System

57i Series Kits > Performance Air Intake System
  • 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
The K&N 57I-2501 Performance Air Intake System fits some Ford Focus models. See vehicle applications link for details.
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]

Product Specifications

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

K&N 57I-2501 Performance Air Intake System Product Reviews