Good ole regular Motorcraft air filters are your best bet-
http://www.amazon.com/gp/product/B000...
If you find the MAF dirty clean it with this kit only-
http://www.amazon.com/gp/product/B009...
In this video I go over why I will never using cleanable air filters. Instructions on how to clean the MAF properly can be found Here-
   • How To Clean A Mass Air Flow Sensor P...