There is a thread on this and on which shazaam gave views.
I ran the JHP filter (same as ITG) on my 996 with a 45/50 system and it wroked well. I did take the mesh off the front of the air ducts on the basis that after any long ride it was full of bugs and must have had some limiting effect on airflow. Oddly, whenever I looked in the airbox thee was no muck/stones/flies/small birds etc., so maybe the mesh attracted dirt...
