Improvised air filter, is it good idea?

[Aldendiaz]

Can I know where can I buy cabin air filter for honda civic? Thanks

[baludoy]

^ for which honda civic bos? is it for the fd?

kung para sa fd outside of the casa madami na din mapagbibilihan

ang ek alam ko parang walang provision para dito.

if it's for the es and the fb, that i'm iffy about