UPR Single Valve Catch Can for 2016+ Ford Focus RS – TunePlus, Inc
GO-PARTS Replacement for 2007-2018 Ford Focus Air Filter (RS / S / SE / SEL / ST / Titanium) - Walmart.com
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 filter for RS 2.3l | Ford Focus RS Forum
The 2016 Ford Focus RS Gets an Advanced Torque-Vectoring AWD System
Green Filter Air Filter Kit with Outerwears Cover - Ford Focus/Focus R – FSWERKS
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
Genuine Ford Focus RS Mk3 EcoBoost Oil Filter - Focus RS Mk3 2.3T - Service - Mail Order - Pumaspeed Milltek Ford Performance Tuning Milltek Sport Exhaust Ford Fiesta Focus ST RS Parts Specialist