Amazon.com: Green Filter Air Filter Kit with Outerwears Cover - TiVCT Focus/EcoBoost Focus ST/Focus RS/EcoBoost Transit Connect/EcoBoost Escape : Automotive
2014-2018 Focus RS Carbon Fiber Air Box Cover | California Pony Cars
K&n filter vs green open ended? | Focus Fanatics Forum
Ford Focus ST Mk3 RS Mk2 Custom Airbox Air Filter Box Window Zetec Line Mountune | eBay
2013-2018 FOCUS ST PERFORMANCE RS COLD AIR INTAKE BOX| Part Details for M-9603-FSTA | Ford Performance Parts
COBB Tuning SF Intake Replacement Filters FOCUS ST 2013-2018 FOCUS RS 2016-2018 | eBay
Car Air Inlet Filter Box Protection Intake Cover Net For Focus ST RS Kuga 2012 2013 2014 2015 2016 2017 2018 Auto Part Sticker|Air Cleaner Assemblies| - AliExpress
cp-e™ aIntake™ Focus ST Spare Airbox Cover RS Plexiglass - cp-e™
Motorcraft Oil Filter, Fl-400 S Focus St/Fiesta St - Motorsport Engines & Components
Modifying stock ST airbox cover to RS specs. | Ford Focus ST Forum
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Ford Focus ST Mk3 RS Mk2 Custom Airbox Air Filter Box Window Zetec Line Mountune | eBay
Ford Focus ST Mk3 RS Mk2 Custom Airbox Air Filter Box Window Zetec Line Mountune | eBay
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Ford Focus ST Mk3 RS Mk2 Custom Airbox Air Filter Box Window Zetec Line Mountune | eBay
cp-e™ aIntake™ Focus ST Spare Airbox Cover RS Plexiglass - cp-e™
FSWERKS Green Filter Cool-Flo Air Intake System - Ford Focus ST 2013-2
If you want a really easy mod, go for the green filter and the RS air box. It's super easy to install and it sounds great! : r/FocusST
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Green Filters 7159 Performance Air Filter installed on Jordan Jackson's Ford Focus RS on Wheelwell
