I too have the Big Sucker, with a simple smooth chrome cover the same diameter as the small end of the filter. The entire perimeter of the filter is exposed to the atmosphere. It will suck more air than I can use.
Thanks for all the replies. Keep the pics coming Its cool to see everyone's tastes and choices. Rufasim you are correct however the ness cleaners have a larger thickness for stage 2 vs stage 1 unless I read it wrong.
I've got the SE Stage 1 on mine with a Willie G cover.
What no one has said yet is you will need a new ECM map with the intake. The engines on HD's run lean as it is. Adding an air cleaner will make it worse. I can tell a HUGE difference in mine with the air cleaner, slip-ons, and PC V with the proper map.
I'd like to figure out what to do with the breather to get it out of the intake or figure out how to cut down on some of the oil going into it.