Those filters work fine, I have one and my intake tube is clean and clear of debris, also my TB is clean. If it was letting in all this dirt and dust that you guys seem to think it does than my intake would be filthy and its not. I clean it a couple times a year and oil it up, and after about 40 miles I clean my maf and IAC it takes an hour and its no big deal. If you let the filter dry over night you don't get the oil problems either, a ton of people use these filters and if kept up properly they work just fine.