2012 wrx air filter

So I noticed on my AF learning 1 gauge on my Cobb is reading pretty high and likes to fluctuate a lot from 6.25 to 7.03 even got up to 8.69. I know it’s not super bad but I’m guessing I just need to clean my MAF sensor with some CRC and maybe even get a new air filter since a mechanic I know mentioned it’s pretty dirty when he did a diagnostic on my car. I’m wondering what would be the best air filter for my car. I’m gonna be getting a cold air intake at somepoint but right now is not that time. I have a 2012 wrx with an invidia catted downpipe with a tune. Is there an air filter I can get at autozone or orileys real quick that will be good and won’t effect my tune?