Amazon.com: K&N Cold Air Intake Kit: High Performance, Increase Horsepower: Compatible with 2013-2018 FORD (Focus ST) 69-3518TS : Automotive
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Focus RS K&N 57s Filter
Ford Focus RS Drop In Replacement High-Flow Air Filter by K&N
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Red K&N Filter Air Intake System Kit For 2012-2014 Ford Focus 2.0L L4 Non-Turbo | eBay
K&N Typhoon Cold Air Intake Ford Focus 2012-2018 (Non Turbo) – Import Image Racing
K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter: 2018-2020 FORD (Escape, Focus IV) , 33-3131 - Walmart.com
Performance Air Intake System
K&N Focus Drop-In Filter (00-04 Zetec) 33-2819
K&N engine air filter, washable and reusable: 2007-2019 Ford/Lincoln/Volvo L4 1.5/1.6/2.0/2.3 L (C-Max, Escape, Grand C-Max, Kuga, Transit Connect, Focus, Tourneo, MKC, V40, V70, C30, S40) E-2993 - Walmart.com
Amazon.com: K&N Cold Air Intake Kit: High Performance, Increase Horsepower: Compatible with 2012-2018 Ford Focus, 2.0L L4, 69-3517TS : Automotive
13-18 Focus ST 2.0L K&N Replacement Air Filter
Ford Focus RS Drop In Replacement High-Flow Air Filter by K&N
K&N Drop-In Air Filter, 2013-18 Focus ST/16-18 Focus RS, Air Intake: Store Name
Air Intake & Filter | Ford Focus RS Forum
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2013+ Ford Focus ST owners – we have a drop in K&N air filter for you in stock! – ModernPerformance.com Blog
Replacement Air Filter
Ford Focus Mk3 K&N 57I Cone Air Filter - Focus Mk3 1.0 EcoBoost - Filters - Panel - Pumaspeed Milltek Ford Performance Tuning Milltek Sport Exhaust Ford Fiesta Focus ST RS Parts Specialist
K&N® - Ford Focus RS / ST Gas with Lid 2018 57S Performance Generation I Round Red Airbox with Lid