Header, Intake, & Exhaust - AIR FILTER COMPATIBLE?

so here's the deal. i have a 2001 ex with a AEM cold air system. i was wondering if i have to use an
AEM filter as the replacement or can i use K&N or some other brand? any answers would really help. thanks.

you can use a K&N its just a filter after all

just make sure that the inside diameter matches the diameter on the intake tube

get the K&N. they'll last longer than your car.