I got my AEM CAI
used and it didn't come with a filter. I bought Apexi because I heard good things about it and it barely beat K&N. There was slight fitment issues so a friend gave me one of his generic ebay filters. I noticed you can hear the hissing more and quicker acceleration but I am a little worried about the filtration quality. So if this topic could get revived I'd appreciate that, if not that's cool to. I don't think my filter will kill my car.