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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
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Amazon.com: K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-9289 : Automotive
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Amazon.com: K&N Cold Air Intake Kit: Increase Acceleration & Engine Growl, Guaranteed to Increase Horsepower up to 7HP: Compatible with 2.0L, L4, 2013-2018 FORD (Focus ST), 69-3518TS : Automotive
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Amazon.com: K&N Cold Air Intake Kit: Increase Acceleration & Engine Growl, Guaranteed to Increase Horsepower: Compatible with 2.5L, L5 2005-2011 FORD ( Focus XR5, Focus II), 57I-2503 : Automotive
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K&N K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter: 2018-2020 FORD (Escape, Focus IV) , 33-3131 in the Automotive Hardware department at Lowes.com
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