Found a link that has a good writeup of what I want to do http://www.jeepforum.com/forum/f11/another-cowl-air-intake-write-up-741764/ Search on this site wasn't finding it.
I used this
http://shop.trailheadoffroad.ihostnetworks.com/productinfo.aspx?productid=XJCI91-01
Went together pretty easy. Filter has a lot of surface area.