Engineered Power: YS Racing cold air filter for ford focus st , can increase the sound of the Turbo and improve throttle response Washable & Reusable： Dry air filter, no need to spray oil,does not affect the air flow sensor.Flows more air without sacrificing filtration , can continue to use 10,000 to 15,000 miles, flush with water, natural dry can continue to use, life span of more than 200,000 miles Unique feature：YS Racing air filter provides two flow modes, the filter end cover is opened, turbo sounds come through a lot clearer, delivers more air for faster throttle response, and you can experience a strong sense of push-back when driving. When the end cap is closed, the turbo sounds become smaller and the engine will run smoothly. YS provides a hose clamp to secure Video experiment: This ford focus st cold air filter can provide a higher flow rate to the engine at the same air flow rate Suitable for:2009-2018 Ford Focus/2012-2018 Ford Focus ST/2015-2018 Ford Focus RS/2013-2019 Ford Escape / 2008-2013 FORD Kuga/2014-2016 Transit Connect / 2015-2019 MKC /2010-2020 Ford C-Max/ 2010-2015 MAZDA 5/2012-2015 VOLVO V40 II/ 2010-2014 VOLVO V70 III/ 2007-2013 VOLVO C30/2009-2013 MAZDA 3/ 2007-2012 VOLVO S40 II/2007-2012 VOLVO V50/2008-2009 VOLVO C70 II This Ys racing high performance air filter can be used as an OE replacement for Focus ST RS models. It can bring a surprising driving experience, you can hear the turbo much better. Two different intake modes for intense driving on the track, as well as for daily commuting driving. YS has a long service life of 200,000 miles. YS is dry air filter, so clean up is also very simple, clean water and then dry can continue to use. Compatible Vehicles: 2010-2020 FORD C-Max II; 2013-2020 FORD Escape; 2010-2020 FORD Grand C-Max; 2013-2019 FORD Kuga II; 2014-2019 FORD Transit Connect; 2015-2019 LINCOLN MKC; 2012-2018 FORD Focus; 2010-2018 FORD Focus III; 2015-2018 FORD Focus RS; 2013-2018 FORD Focus ST; 2014-2018 FORD Tourneo Connect; 2015-2017 FORD Furuisi; 2010-2015 MAZDA 5; 2012-2015 VOLVO V40 II; 2013-2014 VOLVO V40 Cross Country; 2010-2014 VOLVO V70 III; 2008-2013 FORD Kuga; 2009-2013 MAZDA 3; 2007-2013 VOLVO C30; 2007-2012 VOLVO S40 II; 2007-2012 VOLVO V50; 2009-2011 FORD Focus XR5; 2007-2010 FORD C-Max; 2007-2010 FORD Focus II; 2008-2009 VOLVO C70 II Cross Reference: AC Delco A3626C; BMC FB55908; Champ Labs. AF6908; Ford 1296204; Ford 1477153; Ford 1496204; Ford 1511213; Ford 1708877; Ford 1848220; Ford 7M519601; Ford 7M519601AC; Ford AV619601AL; Ford CV6Z9601A; Ford ED819601AA; Fram CA11114; Jason JA753P0; Luber-Finer AF6908; Mazda Y64213Z40B; MicroGard MGA49017; Mobil AF6908; Motorcraft FA1908; Parts Plus AF6149; Premium Guard PA6149; Pronto PA6149; Purepro A6149; Purolator A36149; Repco RAF339; Ryco A1630; Service Champ AF6149; Simota OFO010; STP SA11114; Valvoline VA288; Volvo 16899132; Volvo 30792881; Volvo 31338216; Volvo 76899132; Volvo 7699132; Warner WAF6908; Wesfil WA5175; WIX 49017