so ive had my 03 wrx for about 4 years now. its been nothing but problems for me and of corse the dealer screwed me over with my warrenty. but with all that aside i thought i have been getting a lot of dust in my car. it turns out i dont ever have the hvac filter in my car, grrr. ok done with my ranting lol. how much do one of these filters cost?
this shows exactly how you do it I didnt think of doing it either until a year after I had the car its about $10 total including shipping from ebay
You could also stick a fabric softener sheet on top of the filter so your car smells all nice for a little while