i currently run a slightly modded stock air box,and a K&N drop in filter,after installing it i did notice an improvement,what I'm wondering is if a K&N cold air kit or even just a cone type filter and intake tube would offer any more gains in performance,taking in consideration the 52mm throttle body,and the m1 intake and the headers i would i need all the airflow i can get...by the way the K&N drop in filter flows 626 cfm.,which i thought was pretty high for a panel type filter....any opinions ?