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57S-4000
$171.99 USD
MSRP $312.19 44.9% Off
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K&N 57S-4000 Performance Air Intake System

57i Series Kits > Performance Air Intake System
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.9 out of 5 stars   27 Customer Reviews
  • Guaranteed to increase horsepower
  • Designed to improve torque and acceleration
  • Replaces entire factory air box and air filter system
  • Washable and reusable lifetime air filter
  • Easy to install, usually in 90 minutes or less
  • Lasts up to 100,000 miles before service is required (depending on driving conditions)
  • K&N Million Mile Limited Warranty
The K&N 57S-4000 Performance Air Intake System fits some Ford C-Max, Ford C-Max II, Ford Focus, Ford Focus II, Ford Focus III, Ford Focus RS, Ford Focus ST, Ford Focus XR5, Ford Grand C-Max, Ford Kuga, Ford Kuga II, Ford Tourneo Connect, Ford Transit Connect, Mazda 3, Mazda 5, Volvo C30, Volvo C70 II, Volvo S40 II, Volvo V40 Cross Country, Volvo V40 II, Volvo V50, and Volvo V70 III models. See vehicle applications link for details.
The K&N 57S-4000 Performance Airbox replaces the restrictive factory air filter and air box lid. K&N performance air boxes are designed to dramatically reduce air flow restriction as well as smooth and straighten air flow. This allows your engine to inhale a larger amount of air than the factory air filter assembly. More air means more usable power and acceleration throughout the engine’s RPM range. The 57S-4000 Performance Airbox comes with an oversized conical K&N high-flow air filter and an injection molded air box lid with the K&N logo embossed on top. The air filter can be used for up to 100,000 miles before servicing is needed depending on driving conditions. This performance air box is relatively easy to install into the air box base with commonly available tools. K&N builds these air box systems to last for the life of your vehicle and they are backed by K&N's Million Mile Limited Warranty. Some K&N 57S Series Performance Airboxes are compliant with the latest TUV emissions and sound regulations. Check the K&N catalog or website for vehicle applications and specific TUV status for each vehicle and air intake.

[More Information on K&N 57S Performance Airbox Systems]

Product Specifications

Replacement FilterE-9289
Air Filter ColorRed
Air Filter MaterialCotton Gauze
Air Filter Outlet ShapeRound
Clamps IncludedNo Clamps Included
Clamp MaterialStainless Steel
Clamp StyleRegular
Couplers IncludedNone
TypeGen I
Product Style57i Series International Kits
Air Filter Height7.688 in (195 mm)
Street Legal In All US States No
TUV Approved (Europe)See Application Link Above
TUV Certificate NumberTU-025979-C0-206
Weight4.2 lb (1.9 kg)
Product Box Height11.81 in (300 mm)
Product Box Length15.34 in (390 mm)
Product Box Width11.81 in (300 mm)
California RestrictedNot legal for sale or use in California
Mounting Hardware IncludedYes
Warranty1,000,000 Miles/10 Year
WARNING: Cancer and reproductive harm--www.P65warnings.ca.gov

K&N 57S-4000 Performance Air Intake System Product Reviews

Friday, August 3, 2018 - Part 57S-4000
Have used Ki&N products in the past on performance and race cars, so it was a simple decision to use this product on my current project. Delivery was promp and the installation was easy, taking approximately 10 to 15 minutes. I am not using the rubber end plug and the induction noise is not intrusive, there is some audible turbo whine, on de acceleration in stop start traffic. At cruising speed the vehicle has no increase in cabin noise. The addition of this product to the engine remap has helped in the overall and increased performance. Without running on a Dyno, it is impossible to say what the increase in power may be, however there certainly is a difference, with roll on acceleration in higher gears.. Highly recommended product, from a world leader and renowned company.

Greg Chaman
Warwick, United Kingdom
Tuesday, May 29, 2018 - Part 57S-4000
Very happy with the K&N. Fits my car spot on and sounds really nice, so over all very happy.

Darren Thomas
Tonyrefail, United Kingdom
Friday, May 4, 2018 - Part 57S-4000
Really glad I bought this for my car. Definitely a good investment.

Daniel McPhee
Feltham, United Kingdom