Jason - I bought mine at
Dodge 5. 9L Cummins 94-02
And as I recall you can down load the installation instructions there. I am going by recall on this but I think they said the FP-100 is good for up to 500 HP. The FP-150 good up to 1200 hp. You probably need to call and see what they say about when you really need the draw straw. I am kind of assuming they feel if you are going to be over 500 hp you will need 1/2" all the way from the pickup in the tank to the VP.
I think I will see if I can get the quick-disconnect off without lifting the truck bed as having the 70 gallon cross bed TransferFlow and 5er hitch rails(forgot about those) would make this a chore. If I cannot disconnect I will make the connection to the 3/8" rubber line the Vulcan kit uses to my campaign pump. I am also leaning toward just taking out the OEM filter from the canister and leave it as is which means I have the fuel heater but no added restriction from the OEM filter. I think some have done this when installing the FASS.
Jason it kinda looks like you will be more happy with the FP-150 with your set up but really only you can make that decision. As I remember really the only difference between the 100 and 150 is they recommend the 1/2" draw straw but you can find that out by comparing installation instruction and the cost was only like $10 or something different.
I am only thinking about 350 to 400 HP with better torque for towing. I need a new pump anyway as my campagn pump will go pretty soon and with mild injectors, programmer, etc. to get there for sure need the new more reliable pump.
I will post how the installation goes here if I get to it before you do. I would like to install in a week or so but life has a habit of getting in the way.
I hope I helped a little and maybe somebody else will chime in more knowledgeable than I am at this point not having installed it yet.
I fibbed a little the price is listed as the same how kool is that!!!!!! I think you should look for yourself as the 1/2" draw-straw is listed as a $36 adder if I am reading the site right.