Experience a noticeable boost in your vehicle's performance with the K&N 57S-4000 Performance Airbox. This innovative upgrade replaces your factory air filter assembly to reduce airflow restrictions, allowing your engine to intake more air for increased horsepower and better acceleration. Whether you drive a Ford C-Max, Focus, Volvo, or Mazda, this performance intake kit is engineered to deliver an ideal combination of power and efficiency.

Key Benefits

• Enhanced Airflow & Power: The optimized design, featuring an oversized conical high-flow air filter and injection-molded lid, improves engine breathing, boosting torque and acceleration.
• Easy Installation: You can install the airbox using common tools, making for a hassle-free upgrade.
• Long-Lasting Filter Life: Enjoy up to 100,000 miles of performance, depending on driving conditions, before the filter requires servicing.
• Trusted Warranty: Backed by K&N’s Million Mile Limited Warranty, this system is built to endure.
• Emissions Compliance: Selected models meet TUV emissions and sound regulations, providing you with peace of mind on the road.

Upgrade now and experience the transformation in your vehicle’s performance. Buy today to enjoy enhanced power, reliability, and efficiency on every drive.

For additional performance solutions, visit our Air Intake Systems collection.

Compatible Models