i apologize for the nooby question,
but how often should you change the air filter for it?
and i checked online and they said the size for the filter, or the part number is x-1013BR.

where's a good place i could get a replacement filter? online or near 818?
and does it have to be an injen branded replacement filter?

 

those filters are washable you know idk y you want to spend 50 dollars per filter just to change 'em

 

it's just an option
cuz i'm buying this injen CAI from this guy and he said he's been using it for a year and 8 months.

if they're always reuseable, and I can just clean it over n' over again that'd be awesome.

he just suggested it might be better if i get another filter for it

 

wash it and re-oil it
heres a D.I.Y.
https://www.scionlife.com/forums/viewtopic.php?t=30892

you might want to check to see if theres any gapping holes in the filter, if so replace it...