There were some interested in a pre-filter for the aFe stage II intake system. When I looked for one, there wasn't any information to be found about it so I thought I would update everyone with part numbers and some pictures.
I went with a pre-filter from outerwears.com. They specialize in pre-filters for all different intake systems. I emailed them the dimensions of the aFe filter and they responded back saying I needed to use part number 20-1687. They have several different colors (red, orange, purple, blue, yellow, etc.). I went with lime green, just to be a little different. Install was very simple, unbolt the filter, slide it over the filter and bolt the filter back on. On with the pictures.