H2Daddy........
Here's a shot for you.
I added the filter a couple of months ago and my mileage increased .2 I've been looking for a tube and an offroad friend suggested the Airaid tube. I changed it, went to Magnecor sparkplug wires, changed the height & tires all in a span of a couple weeks so can't really tell you anymore specifically on the air system.
My current mileage with 37s is 11.9 and that's around town......as far as where to get the tube, I bought this one thru
www.macromotive.com
Cheers!
Ed