Hey guys, so I have a question on an Injen intake. I bought my G coupe used and the intake was already there. I believe the last time I replaced the filter it was with this model:
X-1021-BB

How often would you recommend replacing it, and I imagine it has to be replaced not just cleaned? I'm pretty sure it's been way too long since I replaced it, but I just forgot about it. Would there be any other suitable replacements?

Thanks for any help.