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Air flow direction on third party filters (not OEM) should be pointing down. OEM filters have an UP arrow and should match the direction on the air filter tray.
@wkinning is correct. Any air filter with a airflow direction should go down.
![KSI - Dirty [Official Visualiser]](http://i.ytimg.com/vi/VoDh1h1dPUE/mqdefault.jpg)
Air flow direction on third party filters (not OEM) should be pointing down. OEM filters have an UP arrow and should match the direction on the air filter tray.
@wkinning is correct. Any air filter with a airflow direction should go down.