{"product_id":"k-n-performance-air-intake-system-57s-series-ford-focus-st-rs-mk3","title":"K\u0026N Performance Air Intake System (57S Series) - Ford Focus ST\/RS Mk3","description":"\u003cp\u003e\u003cspan\u003eImprove your vehicle’s performance with a K\u0026amp;N Classic 57S Performance Air Intake System, engineered to reduce airflow restriction, increase horsepower and support improved torque and acceleration. Designed as an upgrade over the restrictive factory airbox, the 57S system allows your engine to draw in more air, helping deliver improved performance throughout the rev range.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cem\u003eProduct Specifications\u003c\/em\u003e\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCar Fitment:\u003c\/strong\u003e Ford Focus RS Mk3 (2016-2018), Ford Focus ST Mk3 (2012-2018)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 57S-4000\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.knfilters.co.uk\/warranty\"\u003eNo-Hassle Lifetime Limited\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Cotton Gauze Filter, Polyethylene Airbox Lid\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eFeaturing a fully enclosed, injection moulded airbox and a high-flow K\u0026amp;N cotton gauze air filter, the 57S system is designed to smooth and straighten airflow while maintaining effective engine filtration. The enclosed design connects to the factory intake hose and fits within the original airbox space, providing a practical performance upgrade without the need for a more exposed intake layout.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDesigned specifically for compatible vehicles, the K\u0026amp;N Classic 57S kit replaces the complete factory airbox and air filter assembly. The removable airbox lid provides easy access to the filter for cleaning and maintenance, while the vehicle specific design helps make installation straightforward using commonly available tools. Installation can typically be completed in 60 minutes or less, depending on the vehicle application.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWith a washable, reusable lifetime air filter and K\u0026amp;N’s No-Hassle Lifetime Limited Warranty, the Classic 57S system offers a long term alternative to standard disposable air filters, combining improved airflow with reduced ongoing replacement costs.\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cem\u003eKey Features\u003c\/em\u003e\u003c\/h3\u003e\n\u003cul data-spread=\"false\" data-pm-slice=\"3 3 []\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eIncreased Horsepower \u0026amp; Torque:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Designed to reduce intake restriction and help improve engine output.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eEnclosed Airbox Design:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Helps smooth and straighten airflow while retaining a factory style intake layout.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eHigh-Flow Cotton Air Filter:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Uses oiled cotton gauze to balance airflow with effective engine filtration.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eWashable \u0026amp; Reusable Filter:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Clean and reuse the air filter instead of repeatedly purchasing disposable replacements.\u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eVehicle Specific Design:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Replaces the original factory airbox and filter assembly on compatible vehicles.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eStraightforward Installation:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Designed to use the original airbox space and commonly available tools.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLong Term Value:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Built for long term use and backed by K\u0026amp;N's No-Hassle Lifetime Limited Warranty, subject to the manufacturer's terms.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eUpgrade your vehicle with a K\u0026amp;N Classic 57S Performance Air Intake System for improved airflow, a practical enclosed design and the long-term benefits of a washable, reusable air filter.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003ciframe width=\"360\" height=\"203\" src=\"https:\/\/www.youtube.com\/embed\/QtOl0IXRh2Q?si=yOgZNsMp4CmU3z3b\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e","brand":"K\u0026N Filters","offers":[{"title":"Default Title","offer_id":62949155078531,"sku":"57S-4000","price":229.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0809\/6684\/4690\/files\/57S-4000_2.jpg?v=1705789962","url":"https:\/\/jxlperformance.co.uk\/fr\/products\/k-n-performance-air-intake-system-57s-series-ford-focus-st-rs-mk3","provider":"JXL Performance","version":"1.0","type":"link"}