UPR Single Valve Catch Can for 2016+ Ford Focus RS – TunePlus, Inc
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BOSCH Original Genuine Car Engine Air Oil Filter Removal Tool Product 0986AF0020 1S7G6714DA For Ford Focus MK3 | ST 2.0 | RS 2.3 - AliExpress
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7159 Green Filter High Performance Cylindrical Air Filter Green Color – FSWERKS
Original Ford Focus RS MK3 2.3 EcoBoost Upgraded Air Filter Box New 1937555 | eBay
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Amazon.com: K&N Cold Air Intake Kit: Increase Acceleration & Engine Growl, Guaranteed to Increase Horsepower up to 33HP: Compatible with 2.3L, L4, 2016-2018 FORD (Focus RS) 69-3539TB : Automotive