I thinks Amsoil is the way to go. I'm thinking about going back to my stock airbox and getting the Amsoil filter and doing a deckplate mod too. Amsoil supposedly gives better filtration along with better airflow than the K&N drop-in or FIPK. Goto www.amsoil.com or even better yet www.gadgetonline.com for all the tests he's done with various setups.