2-302 air pressure drop?/2-6.75"papst fan advice

[slicey]

hi all,
does anyone, oh....i don't know...perhaps Weapon maybe, know what the pressure drop on this core is? high, medium or low? i'm trying to design a w/c box and one of the main criteria is weather to design the inner ducting for series or parallel fans. the ducting chambers will surely increase the airflow impedance but i'm not sure how much more the core will add to it.

also, since this is my 1st venture into to w/c, will someone please advise me on my hardware choices. i'll list my cooling gear 1st, then my comp. stuff next if it makes any difference?
polar flo tt, the core-you know the one i'm talking about a mcp350 modded(1/2" inlet), though i've started to question if this was the right pump for the job? just learned from you guys that popular opinion is to cool the GPU core only and sink the not too hot running DDR3. so....i've got to start researching GPU coolers. also read the maze 4 was a pretty good performer. later, i will look inside my PSU to see if w/c that is feasible or not.
for comp. stuff, i have abit AI7, 3.2E, BFG6800GT, Antec 550 true control.
i could really use your input-good or bad
slicey