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🤣 just helped a friend fit his today and argued with him for nearly 20 mins about it which led me to this thread! - we found some filter brands state “Air Flow” which would mean the arrows face inwards i.e in the direction of air flow e.g Bosch, but others will have arrows pointing outwards or to the front of the car meaning “this side up” or “towards air intake” - he was changing from his OEM filter to a Bosch one which caused our “big argument” because the arrows had to be fitted the other way round so direction of “Air Flow” instead of “Air Intake” - in the end I had to eat my words because he was right 🙄 - depends on the filter brand (instructions are indeed ambiguous)!
Anyhow rant over if this helps even at least one other person from wasting time on this stupid topic then mission accomplished! 🤣
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