Sorry about the dumb question. My car has an Injen intake that was installed by the previous owner but the filter is currently looking kinda dirty. I don't know much about performance air filters or how to maintain them. I usually order parts off PartSouq but this time I just don't now what to search for. Does it need to be an original Injen filter? Will any Injen filter fit? Are there any cheaper alternatives? I think mine is the SP1386 or SP1387. What are my options? I live in Europe and would need to buy from a vendor that can ship here.