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K&N 33-3131 Replacement Air Filter
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Ford decided to be special and make an air filter unit with a replacement part that costs $200. Made my own for $30 of parts and some tape. : r/techsupportmacgyver
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Simple how-to: Replace engine air filter, Ford Focus - YouTube
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Oil Filter For Ford Focus 2 2005 2006 2007 2008 2009 2010 / Focus 3 2011 2012 2013 2014 2015 2016 2017 1109 X3 1109 AY 8692305 - AliExpress
Car Air Filter For Ford Focus Ii Iii 2 3 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 Accessories - Air Filters - AliExpress
COBB Tuning - Ford High Flow Filter Focus ST 2013-2018, Focus RS 2016-2018
