hey i was thinking about adding some extra filtration to the fuel system of my truck. so the question is what one ? my truck is used primarily for towing and i have a 4" exhaust and a superchips tuner with it set on the lowest tune.

i use the lubrication specialists kit. The filters are easy to get (napa) and it installs really easy. I also like it because I don't have to crawl under the truck to change it. I installs in the 2nd alternator spot.

you wouldnt happen to have a pic of the where its mounted. and how small does it filter down to

You can go to their site here: http://lubricationspecialist.com/front/showcontent.aspx?fileid=25 (http://lubricationspecialist.com/front/showcontent.aspx?fileid=25)
...and click on the Duramax universal fuel filter installation link.