I've got an AirDog 165, and a CAT 2um filter, supplying my dual CP3's. So the A/D pulls from my sump sends it through my Baldwin BF1275, then to my Fleetgaurd FF5617, then to my CAT 1R-0750, and finally to the CP3's. I often run through the deserts of California, Arizona, New Mexico, and Texas so fuel stations are few and far between, and often I just have to get fuel where I can. Injectors and CP3's are expensive and breaking down on the side of the road is even worse with those costs. My question is, I know the BF1275 is the best F/WS I can use, but the Fleetgaurd isn't the best F/F I can use. What filter should I use on the A/D that would still flow adequately and compliment my CAT filter? I'm thinking something in the 5-10um rating at 100GPH. Or should I just use the Donaldson P551313 on the A/D and get rid of my CAT filter? Again I can't always get the best fuel, but I always use Stanadyne Lubricity Formula at every fill-up and want the best protection for my 100hp injectors, and dual CP3's. Thanks in advance for any help you guys provide. With that said please provide some evidence to back up what you say, such as micron and GPH ratings.