Extreme PSI :: Air Induction :: Short Ram Air Intakes :: K&N Performance Intake Kit: Ford Focus RS 2016+

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K&N Performance Intake Kit: Ford Focus RS 2016+ #31403

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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.

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

Details

SKU KN-57S-4000

Our price:

$249.99

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PROPOSITION 65
Proposition 65 requires businesses to provide warnings to Californians about significant exposures to chemicals that cause cancer, birth defects or other reproductive harm.

Prop65

WARNING: Cancer and Reproductive Harm. (www.p65warnings.ca.gov)

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K&N Performance Intake Kit: Ford Focus RS 2016+ #31403