K&N Filters 57S-4000 Air Intake System for FORD FOCUS

K&N intake kits are guaranteed to increase your vehicle’s horsepower and torque, and K&N performs rigorous in-house testing to ensure that each kit meets high-performance standards. Published dynamometer charts are available on individual product pages to help estimate performance gains.

K&N air intakes install in less than an hour and come with detailed, step-by-step instructions that are included to help ensure your installation goes smoothly and is done correctly the first time.

Many intakes are now offered with both a dry synthetic and oiled cotton filter options. Experience the convenience of a K&N Dryflow intake kit with a no-hassle, oil-free air filter for easy maintenance. Or go with the intake sold to millions of consumers with a high-flow oiled cotton air filter. Both are proudly made in the USA for trusted quality & reliability.

If your kit includes an oiled filter, it only requires cleaning every 100,000 miles under normal highway driving conditions (as opposed to 15,000-20,000 miles for a disposable filter), and a K&N Dryflow filter can go up to 50,000 miles before cleaning.