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Those numbers correlate to their HD series, which makes getting super fine filters difficult as it uses hydraulic filters not fuel filters. Hydraulic filters are multi-pass rated, and designed more for instant flow and delayed filtration with a closed loop system, vs fuel filters that flow less but filter more per pass. Are you sure 1202 is the correct number? It's not listed on Wix's site. The FF1003 is a HF6604, 3um absolute hydraulic filter. Wix has recently redone their commercial/hydraulic filters. The A07A03G is the cross, and is 3um at 99.5%, which is excellent.. but that is still a multi-pass rating so it's impossible to determine what it is on a single pass. It's a good example of what I mentioned with flow vs filtration. It has 453 sq inches of media and is rated for 26 GPM, perfect for a closed loop hydraulic system. A comparable fuel filter, Donaldson P551313 is 3um at 98.7% and flows 1.7 GPM with 649 sq in of media. So which one do you think will pick up more 3um particles on the first pass? The HF6604 has worked well for many people for a long time, but it sure would be nice if FASS would switch to fuel filter and not a hydraulic filter. The 3405 crosses to the BF1212, which should be a good filter. Wix will not disclose their f/w separation rates.. so your on your own if you insist on running Wix. It cannot be verified if it meets OEM spec or not. The FS1212 does not, but the BF1212 does so the 3405 may or may not. Only way to know for sure is to run a filter with published specs.

In addition to the Winter fronts and resistors you might try a thermal blanket kit on the engine and to insulate the hood. This would hold is a LOT more heat that would normally be lost that the engine has to work make up for and compensate. They are not cheap but neither is diesel fuel. If it helps save on fuel, it may be worth it. http://www.atpwrap.com/html/dodgeram.html

Well the only good thing about the AirDog, FASS, and Raptor pumps is there lifetime warranty. As for the Walbro's you might look into the warranty of it and how much time they give you... As for plumbing I would use a 1/2" Big Line Kit and be done... As for the HD carters... I bought one and it barely made 11 PSI at a idle with a 1/2" Big Line Kit.... Not to mention HD Carter's are not designed for diesel fuels...