{"product_id":"k-n-performance-air-intake-system-ford-focus-st-mk2","title":"K\u0026N Performance Air Intake System - Ford Focus ST and RS Mk2","description":"\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe K\u0026amp;N 57S-4000 Performance Airbox replaces the restrictive factory air filter and air box lid. K\u0026amp;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. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe 57S-4000 Performance Airbox comes with an oversized conical K\u0026amp;N high-flow air filter and an injection moulded air box lid with the K\u0026amp;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. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eK\u0026amp;N builds these air box systems to last for the life of your vehicle and they are backed by K\u0026amp;N's Million Mile Limited Warranty. \u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGuaranteed to increase horsepower\u003c\/li\u003e\n\u003cli\u003eDesigned to improve torque and acceleration\u003c\/li\u003e\n\u003cli\u003eReplaces entire factory air box and air filter system\u003c\/li\u003e\n\u003cli\u003eWashable and reusable lifetime air filter\u003c\/li\u003e\n\u003cli\u003eEasy to install, usually in 90 minutes or less\u003c\/li\u003e\n\u003cli\u003eLasts up to 100,000 miles before service is required (depending on driving conditions)\u003c\/li\u003e\n\u003cli\u003eK\u0026amp;N Million Mile Limited Warranty\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"K\u0026N Filters","offers":[{"title":"Default Title","offer_id":47861525512466,"sku":"57S-4000","price":183.99,"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\/it\/products\/k-n-performance-air-intake-system-ford-focus-st-mk2","provider":"JXL Performance","version":"1.0","type":"link"}