Amazon.com: K&N Engine Air Filter: Increase Power & Acceleration, Washable, Premium, Replacement Car Air Filter: Compatible with 1999-2009 JAGUAR/LINCOLN/FORD (S-Type, LS, Thunderbird, Focus RS), 33-2266 : Automotive
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2017 Ford Focus RS 2.3L L4 Gas Oil Filter
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K&N 57S Air Filter Induction/Intake/Airbox Kit For Ford Focus RS Mk3 - 57S-4000 | eBay
K&N filter for RS 2.3l | Ford Focus RS Forum
K&N Typhoon Air Intake System | 2016-2018 Ford Focus RS (69-3539TB) – MAPerformance
Ford Focus RS / ST Performance Oil Filter by K&N
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E-2993 K&N Air Filter fits FORD FOCUS RS ST 2.0 2.3 2.5 & VOLVO V40 S40 V70 24844199775 | eBay
Amazon.com: K&N Cold Air Intake Kit: Increase Acceleration & Engine Growl, Guaranteed to Increase Horsepower up to 10HP: Compatible with 2.0L, L4, 2012-2018 Ford Focus, 69-3517TS : Automotive
K&N Universal Performance Replacement Air Filter - Auto Specialists
Ford Focus RS Drop In Replacement High-Flow Air Filter by K&N
Focus RS & ST how to install K&N air filter - YouTube
Amazon.com: K&N Engine Air Filter: Reusable, Clean Every 75,000 Miles, Washable, Replacement Car Air Filter: Compatible with 2007-2019 Ford/Lincoln/Volvo (C-Max Escape, Grand, Kuga, Focus, Tourneo, MKC), E-2993 : Automotive
