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 air filter element: Ford Focus RS 2.5, Focus Mk2 07- (not ST) & Focus Mk3 1.0/1.6/2.0/ST250/RS 2.3 & Diesel
K&N Select Engine Air Filter: High Performance, Premium, Washable, Replacement Filter, SE-2993 Fits select: 2012-2018 FORD FOCUS, 2013-2019 FORD ESCAPE - Walmart.com
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 Round Air Filter Fits Ford Focus Fits Volvo C30/S40/V50/V70 - KNE-2993 | 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
2013 Ford Focus III1.0L L3 Gas Air Intake
K&N X-Stream Air Filter and adaptor Ring - Mk3 Focus ST - Focus Mk3 1.0 EcoBoost - Filters - Panel - Pumaspeed Milltek Ford Performance Tuning Milltek Sport Exhaust Ford Fiesta Focus ST RS Parts Specialist
Amazon.com: K&N Engine Air Filter: Reusable, Clean Every 75,000 Miles, Washable, Premium, Replacement Car Air Filter: Compatible with 2018-2020 FORD (Escape, Focus IV), 33-3131 : Automotive
57S-4000 K&N Filters Air Intake System ▷ AUTODOC price and review
Installing a K&N High Flow Air Filter on my 2016 Ford Focus ST - YouTube